- #1
Richard87
- 31
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Assuming that all organisms came from a single original lifeform, wouldn't that mean that all organisms are cousins in one huge family?
Assuming that all organisms came from a single original lifeform, wouldn't that mean that all organisms are cousins in one huge family?
I do not see why this assumption is necessary though... it's perfectly plausible that all lifeforms that have existed on Earth may have different branches if we go far enough back... making them completely unrelated to other organisms.
All three branches of life archaea, bacteria, and eukaryote have DNA.
For your hypothesis to be true, life would have had to evolve in all three independantly in exactly the same way to create DNA with the same structure 3 times.
It is possible that life did start several times and even that completely unrelated forms existed at the same time (and haven't left any fossil record) but the DNA cell won out and all life today descended from it