I can't prove the humans came from apes beyond looking at phenotype between early humans and modern apes

However, I CAN prove that humans, like most multicellular organisms, came from a common ancestor. Endosymbiosis is the process of one unicellular organism forming a relationship with another by first consuming, then using the resources the consumed organism produces. This is an event that we witnessed this year, and has been used to explain why human cells have one set of DNA, but mitochondria have another. This dual-DNA is evident in all animals (mitochondria), plants (chlorophyll), and fungi, but could not happen at the multicellular level due to how much we rely on the endobionts to function. Humans could not have evolved to be as fast or enduring as we did in order to gain the protein necessary to produce large brains without the plethora of mitochondria within our muscle cells. The closest we could come would be endosymbiosis within a cancer cell, which is effectively a unicellular organism with human DNA. This wouldn't transmit mitochondria to the rest of the body's cells, though.