Why is the ocean so salty(where did the salt come from? )

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

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