at what type of plate boundary do plates move apart, resulting in the upwelling of material from the mantle to create new sea floor

How does the study of genetic disorders such as pku biologists understand normal alleles?

Cells are adapted to preform specific functions. which of the following terms refers to this capability?

What causes eclipses? check all that apply. earth's rotation on its axis moon's shadow covering the sun earth's shadow covering the moon earth's orbit and moon's orbit occasionally aligning the moon and sun's gravity pulling in the same direction