If the fossil record isn't good enough to prove evolution, you should read up on genetics. Our genes (and indeed all earthy life), share genetic traits going back to when the earth was a soup of presumably RNA. Humans share genetic information with the earliest of invertebrates or even bacteria.
The question I ponder is known as the origin of chirality (google it, I'm too lazy to explain). It makes sense that atoms can form molecules, and molecules can form amino acids and amino acids can create RNA, and RNA can create DNA, and DNA can create proteins etc. (I'm over simplifying though). But how did initial life chemistry become chiral? The origin of chirality is very much at the fringes of philosophy and science right now.
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