Pigments in the skin act like a filter that can prevent the skin from making vitamin D. As a result, people with darker skin need more time in the sun than people with lighter skin to make the same amount of vitamin D. African Americans have darker skin than other Americans. Researchers were not surprised to discover therefore, that vitamin D insufficiency among African Americans is more prevalent or less prevalent than among other Americans?
more prevalent

The higher the crests of a wave are, the greater the amplitude. When at the beach, Erin knows that there is a low amplitude, so the waves will be larger or smaller?
smaller

Q: The more charged the objects are, the stronger the electrostatic force between them. If Jim decreases the strength of the charge between two of his objects, what will happen to the electrostatic force between them it will increase in strength or it will decrease in strength?
A: it will decrease in strength

Question: The development of better missiles fostered better rocket technologies. As we work to develop things our technology levels as a species decreases or increases?
Answer: increases

*Question*
The closer to pH 14, the more strongly basic the solution. John was working on a chemistry project. He found that the closer to ph 14 the substance was, the substance's basicness became Less or Greater?
**Answer**
Greater

Size restriction: The final body size is limited because as the body size increases, the surface area to volume ratio decreases. If your body size were to increase, your surface area to volume ratio would decrease or increase?
decrease