Because their soft tissue and bones decay or get eaten before a fossil can be made.
Answer:
A variety of adult stem cells can be found, but embryonic stem cells are derived from the three germ layers. The main difference between adult and embryonic stem cells is that adult stem cells are multipotent whereas embryonic stem cells are pluripotent.
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Explanation:
Answer:
so to be honest I don't know how to do this
The ability for cancer cells to divide
indefinitely is made possible because Cancer cells rebuild their telomeres
after every cell division.
At each end of the chromosome, there is a
region of repetitive nucleotide
sequences, this is called telomere and when a cell begins to become cancerous,
it divides more often. Telomeres are crucial for the survival of cancer
cells and they are
maintained by an enzyme called telomerase.