Earth’s change in a yearly cycle because of the tilt of its rotation axis and Earth’s around the Sun.

it cools slower in the earth meaning the crystals have more time to form than lava on the surface

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