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mamaluj [8]
3 years ago
6

Why were the firstcells probaly anerorcbic?

Biology
2 answers:
Gemiola [76]3 years ago
6 0
The reason scientists believe this is that there was basically no oxygen in the atmosphere at this time, which meant that cells needed to be anaerobic to survive,<span> going around the problem of no oxygen in the atmosphere.

Hope this helps.</span>
Paul [167]3 years ago
3 0
The first cells had to be anaerobic because most of the oxygen in the atmosphere was produced by living organisms. The first organisms couldn’t use oxygen as an electron acceptor because there wasn’t enough of it to use. Only after later organisms had created oxygen could organisms dependent on oxygen evolve. I don’t know of any scientists who thinks the first cells were heterotrophs. All the ones I know of believe they were chemolithic autotrophs. If you stop and think about it for even a second you will see that the first cells couldn’t have been heterotrophs. By definition heterotrophs rely on eating other living things to survive. How could the very first living thing ever to exist have survived by eating other living things? It makes no sense. The first cell can’t have made a living by eating other cells because there were no other cells to eat. It couldn’t be a heterotroph by definition.
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A woman creates new immature ova in the ovary each time she has a menstrual cycle.

Explanation:

During the menstrual cycle, hormones present in the body make the immature eggs 'mature' ones, in the ovary. About in half of the cycle, hormones make the release of the mature egg from the ovary and travels towards uterus. It can remain there for 24 hours and if not fertilized the it breaks down and released out.

3 0
3 years ago
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If a grandfather and grandchild are the only two with a genetic disorder, the disorder must be __________.
Anna35 [415]

The disorder where the grandfather and the grandchild are affected is related with the X chromosome and is called Sex linked or X linked disorder.

<h3><u>Explanation:</u></h3>

All the sex linked disorders are recessive in character i.e the normal allele is dominant over the mutated allele. In females, there are 2 X chromosomes, so the mutated allele is only expressed when there are both the mutated alleles, else its masked by the dominant normal allele. But in males, there's only one X chromosome, so if a mutated allele is present, it's readily expressed.

If the Grandfather is diseased, then he must have that mutated allele in X chromosome. Through reproduction, its received by the mother, but she is normal because the other allele received from grandmother was normal. But mother has one of the X chromosomes with mutated allele, which is received by the grandson who again becomes diseased. So the disorder must be X linked disorder

7 0
3 years ago
Why type of cells in your body are created through the cell cycle and mitosis?​
anygoal [31]

Mitosis is a way of making more cells that are genetically the same as the parent cell. It plays an important part in the development of embryos, and it is important for the growth and development of our bodies as well. Mitosis produces new cells, and replaces cells that are old, lost or damaged. Hope I helped! ^^

__________________________________________________________

有糸分裂は、親細胞と遺伝的に同じであるより多くの細胞を作る方法です。それは胚の発達において重要な役割を果たしており、私たちの体の成長と発達にとっても重要です。有糸分裂は新しい細胞を生成し、古い、失われた、または損傷した細胞を置き換えます。私が助けてくれたらいいのに! ^^

6 0
3 years ago
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iragen [17]

Answer:D. nucleus

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3 years ago
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Andreyy89

Answer:

Carbon dioxide, nitrous oxide, and methane

Explanation:

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