Different proteins do different tasks in every living thing, and many small variations in proteins can do the same tasks, and you don't necessarily need different proteins for a different body plan.The question is how would a random mutation result in a functioning protein before you have any creatures in that phyla? You can't have a phyla without different proteins doing certain tasks. It is an essential step in getting a new phyla. It may be that two different species of bird cannot mate, yet they still have all the same proteins. That doesn't answer the question.
Why not?You can't have a new phyla without new proteins.
Why?Still, to get a new phyla you would need thousands of these proteins all at once.
Citation?The odds of a random mutation making a functional protein is 1 out of 1 with 40 zeros after it.
[Note: the singular of phyla is phylum]
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