according to the fossil record, when did the earliest animals appear on earth? 300 million years ago 55 million years ago 3 billion years ago 580 million years ago 420 million years ago
Answers
According to the fossil record, the earliest animals appeared on Earth around 580 million years ago.
What is the fossil record? A fossil record is the history of life on Earth as recorded in the remains of dead animals and plants. Paleontologists study fossils and their environment to learn about the history of life on Earth. The fossil record is a significant resource for understanding the evolutionary history of life on Earth.What is the importance of the fossil record? The fossil record provides strong evidence for evolution. The fossil record provides the only direct evidence of the history of life on Earth. As such, it provides proof that evolution has occurred, and it provides an abundance of information about the history of life, including the types of organisms that existed, when they existed, and how they were related to each other. The fossil record is particularly crucial for understanding the evolution of animals. Around 580 million years ago, there was a sudden appearance of a broad range of animal life in the oceans. This period is known as the Cambrian Explosion, and it marks the earliest known appearance of animals in the fossil record. Therefore, according to the fossil record, the earliest animals appeared on Earth around 580 million years ago.Learn more about fossil record: https://brainly.com/question/1496858
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Related Questions
What types of bonds are formed between histone proteins and DNA to form nucleosome core particles?
A. polar covalent bonds
B. nonpolar covalent bonds
C. phosphodiester bonds
D. electrostatic interactions
Answers
Electrostatic interactions are formed between histone proteins and DNA to form nucleosome core particles. The correct answer is D.
Histone proteins are positively charged, while DNA is negatively charged. This means that the two molecules are attracted to each other through electrostatic interactions. The histone proteins form a spool around which the DNA wraps, forming a nucleosome core particle.
The other options are incorrect because:
Polar covalent bonds are formed between atoms that have different electronegativities.
Nonpolar covalent bonds are formed between atoms that have the same electronegativity.
Phosphodiester bonds are the bonds that link the nucleotides in DNA.
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I don’t wanna get a bad grade can someone tell me which ones are wrong and which are right
Answers
Answer:
i think number 11 is Carnivore
Crossing the forked and pale mutantsYou continue your genetic analysis by crossing the forked and pale mutant lines with each other. The leaves of the F1 are light green (intermediate between pale and wild-type leaves) and forked. The F2 has six phenotypic classes, as shown below.You designate the forked mutant allele as F (wild type = f+ ) and the pale mutant allele as p (wild type = P).Consider the alleles for leaf color first. Drag the white labels to the white targets to identify the genotype of each F2 class. Remember that p (the pale mutant allele) and P (the wild-type allele) are incompletely dominant to each other.Consider the alleles for leaf shape next. Drag the blue labels to the blue targets to identify the genotype of each F2 class. Remember that F (the forked mutant allele) is dominant to f + (the wild-type allele).Labels may be used once, more than once, or not at all. For help getting started, see the hints.
Answers
First, let's consider the leaf color. Since p (the pale mutant allele) and P (the wild-type allele) are incompletely dominant to each other, the genotypes for the F2 classes are as follows:
1. PP (wild-type color)
2. Pp (intermediate color)
3. pp (pale color)
Next, let's consider the leaf shape. Since F (the forked mutant allele) is dominant to f+ (the wild-type allele), the genotypes for the F2 classes are:
1. FF or Ff+ (forked shape)
2. f+f+ (wild-type shape)
Now, we can combine the genotypes for leaf color and shape to get the six phenotypic classes in the F2 generation:
1. PPFF or PPFf+ (wild-type color, forked shape)
2. PPf+f+ (wild-type color, wild-type shape)
3. PpFF or PpFf+ (intermediate color, forked shape)
4. Ppf+f+ (intermediate color, wild-type shape)
5. ppFF or ppFf+ (pale color, forked shape)
6. ppf+f+ (pale color, wild-type shape)
These are the genotypes for each F2 class based on the given information.
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What is the base sequence of the DNA gene that originally produced this mRNA codon?
Answers
Answer:
A, TCA. Using the corresponding bases working backwards, A becomes T, G becomes C and U becomes A. Hope this helps
Explanation:
the ____system will dilate the pupil when the retina is not receiving enough light, and the_____system will constrict the pupil when too much light hits the retina.
Answers
The sympathetic system will dilate the pupil when the retina is not receiving enough light, and the parasympathetic system will constrict the pupil when too much light hits the retina.
When light strikes the retina, a signal travels through the optic nerve, resulting in the pupillary light response. Because the sensory branch of this reflex is merely sharing the specific sense channel, this is a visual experience. Bright light hitting the retina causes the parasympathetic reaction via the oculomotor nerve, which is then stimulated by the postganglionic fibre from the ciliary ganglion, which contracts and constricts the pupil.
When light strikes the retina in one of the eyes, both pupils constrict. When the light is turned off, both pupils dilate back to their resting state. The reaction is bilateral when the stimulus is unilateral (given to just one eye or both eyes).
The same cannot be said for somatic reflexes. When you touch a hot radiator, you just draw back one arm, not both. Autonomic reflexes are controlled differently than somatic reflexes by the central nervous system. The autonomic system is controlled by the hypothalamus and other CNS sites.
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how many protons and neutrons does argon have
Answers
Answer:
18 protons and 22 neutrons (and 18 electrons if needed).
Explanation:
Hope this helped!
What has the greatest influence on windspeed
Answers
The primary factor affecting wind speed is the pressure gradient between high and low pressure locations.
What affects the wind's velocity?
The difference in pressure between high- and low-pressure zones is known as a pressure gradient.
The pressure gradient and wind speed are intimately correlated, so as the pressure gradient (i.e., change in pressure) grows, the wind speed at that place also increases.
What influences wind speed the most?
Because the sun heats the Earth differently in different regions, creating pressure differences, wind is a result of a horizontal variation in air pressure, therefore the sun is the primary source of most winds.
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Rarefaction causes which of the following to occur?
Physiology / Ear
Answers
Answer:
AOTA(All of the Above)
Explanation:
Rarefaction pulls nearby air molecules toward an object.Rarefaction causes a decrease in air pressureRarefaction always flexes in.What is an advantage to the way the radionuclide information is presented in the Chart of the Nuclides? What is a drawback? 5. (2 pts)What change occurs in the half-life as one moves from the ends of a horizontal line toward the middle? Why do you think this is?
Answers
The Chart of the Nuclides provides a wealth of information about radioactive isotopes and their properties. It is an essential tool for scientists and engineers working with nuclear technology, and it can be used to help understand how nuclear reactions work,
Advantages to the way the radionuclide information is presented in the Chart of the Nuclides There are many advantages to the way the radionuclide information is presented in the Chart of the Nuclides. It provides a wealth of information about the various radioactive isotopes that exist and their properties. It is an essential tool for scientists and engineers working with nuclear technology, and it can be used to help understand how nuclear reactions work, how they can be controlled and manipulated, and how they can be used in a variety of applications. One advantage is that the chart is very easy to read and interpret. It provides a visual representation of the various isotopes that exist, along with their half-lives, decay modes, and other important information.
This makes it easy for scientists and engineers to quickly find the information they need and to make informed decisions about how to use and manipulate radioactive materials. A drawback is that the chart can be quite complex, and it can be difficult to find specific information if you don't know what you're looking for. This can be a problem for people who are not familiar with the chart or who are not trained in nuclear physics or engineering. Overall, the Chart of the Nuclides is an essential tool for anyone working with radioactive materials, and it provides a wealth of information that can be used to understand how nuclear reactions work and how they can be used in a variety of applications.
The half-life of an isotope refers to the amount of time it takes for half of a sample of the isotope to decay. As one moves from the ends of a horizontal line toward the middle, the half-life of the isotopes decreases. This is because the isotopes become more stable as you move towards the middle of the chart. The isotopes at the ends of the lines are less stable and tend to decay more quickly. As you move towards the middle of the chart, the isotopes become more stable and tend to decay more slowly.There are many reasons why this is the case. One reason is that the isotopes at the ends of the lines tend to be heavier and more complex than the isotopes in the middle of the chart. These isotopes are more unstable and tend to decay more quickly. As you move towards the middle of the chart, the isotopes become lighter and less complex, which makes them more stable and less likely to decay quickly.
The Chart of the Nuclides provides a wealth of information about radioactive isotopes and their properties. It is an essential tool for scientists and engineers working with nuclear technology, and it can be used to help understand how nuclear reactions work, how they can be controlled and manipulated, and how they can be used in a variety of applications.
One advantage of the chart is that it is easy to read and interpret, while one drawback is that it can be complex and difficult to find specific information. The half-life of an isotope decreases as one moves from the ends of a horizontal line towards the middle because the isotopes become more stable as they get lighter and less complex.
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I need help!! I suck at biology and I need this for an assignment!! 30 point!
Answers
Answer:
I am just taking the points because you do not need help anymore. COuld you mark me brainliest?
Explanation:
Read the statements that follow.
Pea plants have a mutation that causes their flowers to be white instead of purple. This mutation does not affect a plant's fitness or ability to reproduce because pea plants
are self-pollinated.
Which type of mutation is described in the statements?
Obeneficial mutation
O negative mutation
neutral mutation
O
O positive mutation
Answers
Answer: neutral mutation
Explanation: nothing really changed minus he colour that's why it netural
The cubes below are models of cells made of a jellylike material. One cube is
intact, and the other has been cut into eight smaller cubes.
1 cm
1 cm
Which statement is true for cells represented by these models?
A. There is more total surface area on the eight smaller cells than
there is on the one large cell.
B. There is more total volume in the eight smaller cells than there is
in the one large cell.
C. There is no difference in the ratio of the surface area to the
volume between the large cell and one of the eight smaller cells
Answers
(C) There is more total surface area with the eight smaller cubes than there is in the one large cube.
What is Surface area?
The surface area of an object refers to the overall space filled by its surfaces. Using the formulas, it is simple to determine the surface areas of various 3D shapes in geometry.
What is Cube?
A solid shape with six square faces is called a cube. Because every square face has the same side length, each face is the same size. A cube has 8 vertices and 12 edges. An intersection of three cube edges is referred to as a vertex. The size of a cube's exterior surface is used to determine its overall surface area. The surface area of a cube is equal to 6, the area of one face since a cube has six square faces, each of which is the same size.
(C) There is more total surface area with the eight smaller cubes than there is in the one large cube.
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Why must transcription occur where dna can be found.
Answers
Answer:
because DNA can't leave
Explanation:
look this up, most of the questions on here are can be answered with a quick googIe search
A substance that provides nourshiment and growth or metabolism
O chromosome
O enzyme
O pathogen
о O
nutrient
Answers
This is the science of correct reasoning. The basic components are statements that can be true or false, but never both.
Answers
Answer:
The basic components are statements that can be true or false, but never both. Magnetic Resonance Imaging This is a non-invasive body imaging procedure that uses powerful magnets and radio waves to construct pictures of the internal structures of the body.
Explanation:
PLEASE HELP MEEEE
How did the owl get energy from the Sun (made their own energy, ate producers, ate consumers)?
Answers
Answer:
ate consumers
Explanation:
Answer:
The owl got energy from producers, like plants
I am sorry if I'm wrong.
8. Which of the following is NOT a similarity between plant and animal cells
Both contain mitochondria
Both contain ribosomes
Both have a large central vandle
All are similarities between plant and arimal cells,
* Previous
Answers
Answer:
All are similarities
Explanation:
hope this helps
A student performs an experiment to understand how havinghigh internal salt concentrations impacts marine plants' abilities to maintain homeostasis. The student adds 100 mL of distilled water to two different beakers, X and Y, then adds 3.5 mg of salt to beaker Y and a 5 g piece of seaweed to each beaker. The student observes the seaweed after it remains undisturbed for six hours.
Beaker - Observation
X - Sewead plant swells
Y - Seaweed plant remains the same.
What can be inferred from the observations of the experiment?
O The high internal salt concentration prevents the plants from losing salts by osmosis.
O The high internal salt concentration prevents the plants from losing water by osmosis.
O The high internal salt concentration prevents the entry of water into the plants by facilitated diffusion.
O The high internal salt concentration prevents the entry of salts into the plants by facilitated diffusion.
Answers
The high internal salt concentration prevents the plants from losing water by osmosis. Thus, the correct option is B.
What is Osmosis?Osmosis can be defined as the spontaneous net movement or diffusion of solvent molecules through a selectively-permeable membrane such as plasma membrane from a region of high water potential to a region of low water potential, in the direction which tends to equalize the solute concentrations on the two sides.
Osmosis helps in achieving the state of equilibrium. In the given experiment, the high internal salt concentration prevents the plants from losing water through the process of osmosis.
Therefore, the correct option is B.
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Which is the first stage in the life cycle of a massive star?(1 point)
white drawf
white drawf
nebula
nebula
black hole
black hole
red giant
Answers
Black whole because first stage in the life cycle. Thus Option C is correct.
What is Black hole?
It is a celestial body having a huge gravity and it can not allow the escape of any object from it.
The black hole appears black or invisible, as the light did not escape out of it , so it is invisible.
Black hole can be up Stella, Intermediate, Supermassive and Miniature
A black hole can be calculated from Albert Einstein’s general theory of relativity.
Massive stars converted into supernovae, neutron stars then black holes but sun like stars while end life as a white dwarf.
Thus Option C is correct.
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When reviewing the musculoskeletal system, the nurse recalls that hematopoiesis takes place in the: A) liver. B) spleen. C) kidneys. D) bone marrow.
Answers
photosynthesis is the primary mover of nitrogen, true or false?
Answers
Answer:
False
Explanation:
Photosynthesis has nothing to do with nitrogen.
A child is born without a fully developed heart. He is normal in all other respects, and thus doctors believe that the problem most likely began early in development. During the formation of which embryonic germ layer did the original error most likely occur
Answers
What was the role of the revivalists of the Second Great Awakening in the abolitionist movement?
A.
The revivalists of the Second Great Awakening were against the abolitionist movement.
B.
Many of the revivalists of the Second Great Awakening campaigned against slavery.
C.
Revivalist preachers didn’t believe in slavery.
D.
Most revivalists taught their enslaved people to preach to the American Indians.
Answers
The role of the revivalists of the Second Great Awakening in the abolitionist movement is that revivalist preachers didn’t believe in slavery so they contribute in the abolitionist movement against slavery.
What is the role of revivalists of the Second Great Awakening in the abolitionist movement?Social activism influenced the abolition groups and provide support in their movement. They began efforts to reform prisons and care for the handicapped and mentally ill people.
So we can conclude that option C is the correct answer.
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why does the lb/amp/ara plate fluoresce when the lb/amp plate does not
Answers
The lb/amp/ara plate fluoresces because it contains the ara gene whereas the lb/amp plate does not fluoresce due to the absence of the ara gene.
The ara or arabinose gene must be added to turn on the operon and make the E. coli glow. Green fluorescent protein (GFP) is a protein that glows with a bright green fluorescence and was first isolated from the marine jellyfish Aequorea victoria. Ara gene encodes the regulatory protein that binds to the pBAD promoter; the pBAD promoter binds arabinose and encourages RNA polymerase binding. When arabinose binds to the Ara gene, the production of GFP is switched on.
Because the second plate is the lb/amp plate there is no ara gene or arabinose, this hinders the binding of the RNA polymerase. As the RNA polymerase is not bound the green fluorescent protein or GFP will not be expressed. Thus the lb/amp plate also will not be showing any sort of fluorescence.
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.Using the DNA sequence TACGGTACCATTGCGCAA, determine which of the following choices is the complementary RNA molecule.
ATGCCATGGGAACGCGTT
UACGGUACCAUUGCGCAA
AUGCCUAGGUAACGCGUU
AUGCCAUGGUAACGCGUU
Answers
Answer:
Explanation:
Which part of the female reproductive system produces androgens in females?
1. Uterus
2. Ovaries
3. Vagina
4. Fallopian tube
Answers
The part of the female reproductive system that produces androgens in females is the ovaries. Androgens are hormones that are produced in both males and females and are responsible for the development and maintenance of male characteristics in males and females. The correct option is B.
Androgens are steroid hormones that are responsible for the development and maintenance of male characteristics in males and females. They play a significant role in the development of secondary sexual characteristics in males such as the growth of body hair, muscle development, and deepening of the voice.
In females, androgens are responsible for the development of pubic hair and the maintenance of bone density. In addition to these functions, androgens also play a role in the regulation of mood, cognitive function, and libido. The ovaries are the female reproductive organs that produce the female sex hormones, estrogen, and progesterone.
However, the ovaries also produce small amounts of androgens, such as testosterone, which are important for the development and maintenance of female sexual characteristics. These androgens are produced by specialized cells in the ovaries called theca cells.
The theca cells produce androgens in response to luteinizing hormone (LH), which is produced by the pituitary gland. Once produced, the androgens are converted into estrogen by another group of cells in the ovaries called granulosa cells. This conversion is an essential step in the production of estrogen, which is the primary female sex hormone.
Therefore, the correct option is B. ovaries.
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An article in the local paper is discussing a new copper mine in new mexico. it states that all that is needed to identify a substance is the mass and volume of a sample. is this an accurate statement? why or why not?
a- yes, because mass and volume are unique properties of a substance.
b- yes, because mass and volume allows for finding density, which is a unique property of a substance.
c- no, because although mass is a unique property of a substance, volume is not.
d-no, because only density is a unique physical property of a substance and mass and volume are not enough to find it.
Answers
This is not an accurate statement because only density is a unique physical property of a substance and mass and volume are not enough to find it.
What is density?The density of a material is its mass per unit volume. The most common sign for density is, however the Latin letter D can also be used. Density is defined mathematically as mass divided by volume. The density of a substance is the measure of how densely it is packed together. It is expressed as mass per unit volume. Symbol for density: D or Formula for Density: = m/V, where is the density, m is the object's mass, and V is the object's volume. The density of something describes how compact or dense it is. Let's say you have two boxes, one huge and one tiny. They both, however, weigh the same. That suggests the small box is denser than the large box.
Here,
This is not an accurate statement since density is a unique physical feature of a substance that cannot be found using mass or volume.
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How does blood flow through the human heart in order
Answers
Blood flow through the heart via arteries, ventricles, veins, and valves.
What is the correct order of blood flow?1. An electrical signal is sent to the heart
2. Signal from the atrium's nodes
3. The atria agreement
4. The atrioventricular node receives a signal
5. Signal sent to the ventricles
6. Contraction of the ventricles
When the heart has a pacemaker then that constantly sends a signal. The pacemaker's primary location is at the sinoatrial node in the top right atrium. This node will send a signal to the atria (causing it to contract) as well as the atrioventricular node.The atrioventricular node is located between the atrium and the ventricle. It will transmit the signal to the ventricle (via his bundle) and cause it to contract.The complete question:
"place the steps describing how blood flows through the human heart in order.
signal transferred to the ventricles
the atria contract
electrical signal travels toward the heart
the ventricles contract
signal by the nodes in the atrium
signal received by the atrioventricular node."
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Select the correct answer.
Sue is a veterinarian who has recently started a private practice, and she focuses on the care of companion animals. What can she do to improve
the success of her practice?
ОА. .
Start treating larger animals, such as horses.
OB.
Visit zoos and aquariums for collaboration.
Ос. .
Offer wellness packages for pets.
OD. Focus only on vaccinations.
O E. Charge high fees for her services.
Reset
Answers
Most of the coal we use today is burned in powerplants to produce electricity. true or false
Answers
Answer:true
Explanation:because it you have to burn coal to get the energy
Answer
True
Explanation:
Coal used to be familiar in industrial and transportation/ residential commercial sectors but has since changed in 1961 when coal is now mostly used to produce electricity with the Eletric power sector.