Though pesticide resistance is a man-made problem, how does it relate to natural selection?

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

i think that it is plants

layer 3 is younger than layer 6.

the correct answer to this question is #5