How did mutations change the way scientists viewed evolution?

when scientists discovered that genes can actually regenerate thus producing a more complex gene by mutation some started coming up with theories that will actually explain to the world how man regenerated from a simple living thing to a more complex living thing

Explanation:

prokaryotic cells do not have a nucleus in which the dna is stored in, it floats freely inside the cell.

eukaryote cells do have a nucleus in which the dna is stored in.

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