Answer:
Option B, The controls on cell growth and divisions can be turned on and off
Explanation:
There are signal proteins that control and regulate the cell growth and division process. For instance, mitogens help in removing the negative controls which would otherwise have blocked the cell cycle progression. Then there are growth factors that synthesize proteins and hence stimulate cell growth. Also there are some survival factors that suppress the apoptosis. Based on these three factors the cell division and growth can be turned on or off.
Hence, option B is correct
Answer:
The answer to the question is d
I think the correct answer from the choices listed above is option A. The main system political parties that use to nominate candidates in the modern US political system is the primary system. In a primary the vote is cast by a secret ballot in order to decide the candidate of the party.
Explanation:
4) option D
5) option A
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The answer is B, they were not overlapping in range, so they evolved and became not identical.
