Well, different organisms require different things. A single celled bacteria does not need a lot at all compared to a plant or animal. One cell can support a bacrerium. An animal needs many cells to carry out the functions necessary for it to live.
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Cnidarians were the first phylum that scientists saw tissue level organization in. Tissue level organization meaning cells all of one type start to function in a unified way.
He was the first to provide an explanation of evolution supported by evidence.
Answer:
S phase of the cell cycle
Explanation:
During Mitosis, DNA is replicated during the S phase (Synthesis phase) of Interphase.