HELP!Why some species evolved significantly over time while others did not evolved as much?

Question

thomaster · Answer

Well do you know why species evolve?

xanthe · Answer

due to the environment?

thomaster · Answer

Yes when the environment changes, species will adapt to these changes. 
When will species not evolve very much?

xanthe · Answer

when the environment remains constant?But is that the only factor that cause this?

thomaster · Answer

When an evironmental change doesn't affect 1 specie, but does affect another specie, the first one will not evolve as much the other specie.

xanthe · Answer

oh ok tnx!

jamierox4ev3r · Answer

also in evolution by natural selection, depending on which animal we are talking here, some animals are just already equipped with the means to survive in their environment, so they have no need to evolve (i.e modern day homo sapiens)

xanthe · Answer

Ty!