What best describes an essential amino acid

An amino acid that an organism needs to intake for nutrition as it cannot be synthesized in the body.

An amino acid that can’t be made by the body, they must come from the food you eat.

They include lobsters and crabs

The return of the wolf to yellowstone national park will probably affect the bird population to some degree, not significantly. while wolves will hunt birds when necessary, they prefer to hunt larger prey. the bird population will most likely only be affected when hunting is scarce for the wolves. birds of prey will also probably not be affected as much as other birds who spend more time on the ground hunting for food as the tend to spend more time in the air or in trees since they do not need to stay on the ground for long due to the nature of the way they hunt.