Vacuole, cell wall, and chloroplast.
They are ectotherms.
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The answer to this is older, but it's not a proven fact even though schools teach it as if it were. It is still just a theory if you think about it with how much the earth moves, areas of rock could be complete upside down and no one would know, it would be like history in reverse.
A genetic mutation. It's known as malformation. It can be caused by a trisomy in one of the alleles, or an affected gene.