D. ALL organisms on Earth contain DNA as their chemical "instruction manual". How does this fact provide evidence for the fact that all organisms share a distant common ancestor?

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 would say it is

the answers are a and c

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .