The position and shape of the bones in the forelimbs of four present -day vertebrates were studied . Two of the organisms

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

2%? i tried finding the exact sorry if it's not 100% correct ; -;

links? do you have a link? i don't see anything?