Explain how crocodiles might have changed over time based on the theory that there was limited food availability. Include in your explanation of change how Natural Selection may have played a role, including all four requirements of Natural Selection (Variation, Heritability, Overproduction, Reproductive Advantage)

Climate like that in the sahara desert have the fastest rates of weathering

According to the article, what valid claim came from the national research council? there is no association between fluoride exposure and increased cancer risk in humans. there is a possible link between fluoride exposure and increased cancer risk in humans. there is a definite link between fluoride exposure and increased cancer risk in humans.

What are the functions of lipids or fat have in the human body?