I’m not 100% sure but I think it’s small
I don't have enough information but it could be natural selection or mutations.
Answer:
Gas
Explanation:
Gas has no definite shape and all.
Stem cells<span> are a class of undifferentiated </span>cells<span> that are able to differentiate into specialized </span>cell<span> types. Commonly, </span>stem cells<span> come from two main sources: Embryos formed during the blastocyst phase of embryological development (embryonic </span>stem cells<span>) and. Adult tissue (adult </span>stem cells<span>).
hope this helps!</span>
