Hi. When a new species evolves, it is because of the enviormental pressure the species finds itself under when the enviorment changes, the population of the species moves to a new enviorment, or the competition from other species gets more intense. That is what I learned in high school anyway. But if a new species evolves because a small branch of species A moves to a new location where enviormental pressure slowly over generations turns them into species B (kind of like Darwins finches), then why are there almost no "species A" left? Like, why are there no ancestors to humans left? No ancestors of whales, no ancestors of foxes? Or do ancestral species exist and I have just missed them? Please tell me. submitted by /u/ice_or_flames [link] [comments]