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scientific evidence backs it up
What evidence?? its just a Theory.nothing has been proven,they are still looking for the missin link
Biologist here, have to take issue with this.
"Just a theory" is a phrase based on an incorrect definition.
Theory, in the scientific sense, does not mean what most people intend it to mean in casual usage. A theory is a functional model used to explain natural phenomena, based on massive amounts of empirical evidence. The proper word for what you're describing is "hypothesis", which is completely different from theory.
Gravity, for example, is a theory. "Theory" is the most certainty you will get out of a legitimate scientist, but it does *not* mean "just some idea".
As far as the missing links thing, evolution is an ever-changing, continuous process. You don't find "missing links" because there aren't any. Evolution occurs on an incredibly long timeline, and the changes that occur between one generation and the next are tiny. It is the accumulated and gradual changes over time that leads to speciation.
/Not being mean, just adding some facts