2. Why do Earth's tectonic plates move? A. Ocean currents near the mid-ocean ridge push the plates.

B. Liquid iron in the outer core causes them to move.

C. Gravity pulls them to the center of the Earth.

D. They float on convection currents in the mantle

Acertain species of fish can have either long or short fins. the allele for long fins is dominant over the allele for short fins. a heterozygous, long-finned fish is crossed with a homozygous, short-finned fish. of the offspring, will have long fins and be , and will have short fins and be .