A dolphin makes a noise underwater that is too high pitched for humans to hear. What type of wave is this?

Echolocation. Dolphins use echolocation underwater, much like whales do. Echolocation allows dolphins to locate objects underwater by transmitting sound waves. They generate a high-pitched sound pulse or click in their foreheads that send sound signals into the water.

lol for the pointsss

(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.