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Why do evolutionists believe that we are related to all living things on earth?

My family tree doesn't consists of bacteria and mushrooms and irises, raccoons and dogs, grass and oak trees and eagles.
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It depends on tracing the biochemistry, going back in time to the first rudimentary elements of life.
The RNA molecule, by acting on copies of itself, can replicate.
RNA occurs from the collision of the right chemical elements, which exist in the hundreds of billions, making all such collisions inevitable.
There are many kinds of RNA proteins which can combine and recombine in many ways because of their structural flexibility.
Slowly, the RNA combines into DNA and the more complex structures of cells.
This makes the wondrous variety of evolution possible.