Me i'm taking the unit test!

in the diagram of the earth’s interior, which part causes the diffraction of p waves made by earthquakes?

a

b

c

d

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