Currents in the ocean are caused by differences in water density. colder, denser water tends to
a.
rise and flow from west to east.
b.
sink and flow from the equator to polar regions.
c.
rise and flow from east to west.
d.
sink and flow from polar regions to the equator.

The answer is D.

Explanation:

Just like how cold air falls and warm air rises the same is with water.

Also the places with the coldest water is the north and south pole. The equator is relatively always warm so yeah.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).