Had to redo the question because it wouldn't let me put pics, but this is my bio homework that I need help with

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

ever get the answers? im stuck on this as well