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3 years ago

What must happen before a cell can begin mitosis??

Biology

1 answer:

ss7ja [257]3 years ago

7 0

Answer - The chromosomes has to be crucially duplicated and it happens actively during the resting phase or interphase.

Reasoning - During the resting phase or interphase you call it, Is important to have the same exact DNA or Chromosomes to be duplicated. If the chromosomes did not duplicate during the interphase then the split of the cell would be unbalance and uneven and likely to cause defects.

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3 years ago

What is nitrogen cycle and, what things need the nitrogen cycle and why is it important?

lapo4ka [179]

Explanation:

So plants need nitrogen to make their proteins (proteins are made of carbon, hydrogen, oxygen, nitrogen and small amounts of sulfer).

Unfortunately, the nitrogen in the atmosphere is inert (unreactive).

But there are still other ways to get nitrogen:

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What do they do?? They use nitrogen from air spaces in the soil and combine it with other subsrances to make ammonium ions and other compounds.

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They convert the nitrogen containing substances into BETTER nitrogen containing substances for the plant

5. Denitrifying bacteria. FINALLY these bacteria turn nitrates and ammonia in the soil into nitrogen gas, which goes back to the atmosphere.

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Note that 1-3 are just ways in which nitrogen can be converted into a more reactive form.

I Hope this helps

6 0

3 years ago

Please help !! 22 points !

Lena [83]

Answer:

The embryo develops the heart, nervous system and face.

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The nervous system is one of the first things to develop, following is the heart and then their face. Physical traits which also develop are the arms, legs and sexual organs.

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3 years ago