How did single cell organisms evolve into multi-cellular organisms? what is the process?
by 
ap1618
ANSWERS: 3
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Symbiosis seems to be the primary mechanism. Investigate how the mitochondria in our cells have been hypothesized to be remnants of cells that were consumed by other cellular organisms and became dependent upon each other.
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Random mutation may have occured that produced a multi-cellular organism. This proved advantageous allowing it to outproduce single cell organisms and thus gain dominancy to what we have today.That is the basis of evolutionary theory.
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Meiosis is thought to have appeared 1.4 billion years ago. The only supergroup of eukaryotes which does not have meiosis in all organisms is excavata. The other five major supergroups, opisthokonts, amoebozoa, rhizaria, archaeplastida and chromalveolates all seem to have genes for meiosis universally present, even if not always functional. Some excavata species do have meiosis which is consistent with the hypothesis that this group is an ancient, paraphyletic grade.
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