Which of the following accurately reflects the beliefs on Earth's early history?a. Scientists believe that microspheres nearly prevented the development of early life.
b. Scientists believe that DNA may have existed before RNA.
c. Scientists believe oxygen was plentiful in the early atmosphere.
d. Scientists believe the early atmosphere lacked the oxygen necessary to support modern human life.

Answers

Answer 1

Answer: The correct answer is D.
From the scientific research conducted so far, we know that in the early Earth's history the atmosphere lacked oxygen and was mostly filled with other gases like methane. The increase in oxygen levels happened when the plants started producing oxygen as a byproduct of the process of photosynthesis.
The research so far also shows that the RNA was present before the DNA and that the microspheres might have been essential to the development of life on Earth.

Answer 2

Answer: Correct answer is D.

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Which process could occur in individual 3?

Answers

In this vague question, the answer is a psychological process.

In person 3, the individual undergoes a traumatic fragment of events that leads to a blind conclusive happenings in the matter of the person. Here, you'll observe that the behavior the individual is eliciting is an arising wariness of different warning signs to seek therapy.

Why have astronomers decided that pluto should be reclassified as a dwarf planet? what happens to most meteors when they enter earth's atmosphere?

Answers

There is a new standard of planets that the IAU set in 2006 and Pluto did not pass it. The new qualification is that a planet must be free of debris around it.

Most meteors are small enough to be burned by friction once it enters the Earth's atmosphere. They are also called 'shooting stars'.

How does a bird fly?

Answers

They need lots of lift to fly (so like wind) and they need to go at a certain speed to maintain flying.

Speciation is the formation of new species as result of evolution by natural selection. What effect could separation of populations have on speciation? A) one half of the species will go extinct if the population is separated
B) the separation populations will always evolve into at least 2 different species
C)if the environments differ enough, the separated populations may evolve differently
D) by separating, the populations will no longer be able to interbreed and will die off

Answers

Animals pass down their features to their children when they breed. When you separate a population (or group of animals of the same species), say by building a large wall, they can't interbreed with each other. This means that if an animal on one side of the border gets an adaptation, it won't pass it on to the other animal. Soon, each side will evolve different adaptations, and the two populations will become so different that they become two different species.

It is possible that one-half wouldn't be able to survive, and go extinct, but it doesn't happen all the time (A is incorrect). Similarly, the populations don't ALWAYS evolve into two different species, though they may (B is incorrect). However, if the environments differ enough, they will acquire different adaptations through evolution. C is correct! Keep in mind that D is incorrect: the first part, the populations can't interbreed, is correct, but that doesn't mean they will die off.

Answer: C

I really found this question and the answer helpful thanks for asking question and thanks for answering question too.

Dna is a polymer consisting of repeating units known as

Answers

DNA is a polymer consisting of repeating units known as nucleotides.

What is a deoxyribonucleic acid (DNA)?

Deoxyribonucleic acid (DNA) can be defined as a hereditary material that is found in the cell nucleus of organisms which contains genetic information of the parent cells.

The Deoxyribonucleic acid (DNA) is made up of repeating strands of four nucleotides such as the adenine (A), thymine (T), guanine (G), and cytosine (C).

The functions of DNA to cells include the following:

transfer of genetic information from one cell to the next generation.
it helps cells to undergo the process of mutations in unfavorable conditions.

Others include: Transcription,cellular metabolism, DNA Fingerprinting,and gene Therapy.

Learn more about DNA here:

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Dna is a polymer consisting of repeating units known as Necleotides.

Why do most enzymes stop functioning after being soaked in a strong acid or base

Answers

Answer:

D) Their bonding structure has been changed.

Explanation:

UsaTestPrep

Strong acids contain many H+ ions. Strong bases contain many OH- ions. These ions disrupt certain bonds within enzymes called hydrogen bonds, ionic bonds, hydrophobic interactions or hydrophilic interactions. Disrupting these bonds causes the active site of the enzyme to change shape, altering the enzymes tertiary structure. This means that substrates can no longer fit in to the enzymes active site because they are no longer complementary in shape, which stops the enzyme performing its funtion

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