Why is an organism's variation important? A Variation ensures that some members of the species survive changes in the environment.

B Variation is what natural selection acts upon and leads to new traits over time.

C Different variations are helpful in different environments, allowing certain genes to be passed on to favor certain traits.

D All of the above are correct.

How do temperature and salinity affect deepwater currents? they create changes in wind direction, moving denser water in the same direction as the wind and causing the deepwater circulation patterns found in the ocean. as temperatures and salinity levels of water increase, the water rises to the surface where it creates currents as it moves to colder regions. they create density differences that cause dense deepwater currents to flow toward the equator where they displace less dense, warmer water above them. they equalize the forces on undersea currents caused by the coriolis effect as they replace more dense water with less dense water.