Which fact is the basis for using the fossil record as evidence that evolution has taken place?
A. In undisturbed layers of rock strata, the older fossils are found in the deeper layers.
B. There are fossils of all life-forms to be found in rock layers.
C. All fossils were formed at the same time.
D. Fossils have been shown to provide a complete record of human evolution

The diagram shows a chicken embryo and a human embryo

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.

This is the nitrogenous base only found in rna