Which phrases describe organisms that formed index fossils? check all that apply.

are extinct

had hard parts

were generally large

were alive only for a short time

lived in a narrow geographic area

no long explanations right to the point i prefer

if you have to just copy and paste this

i will be critical because it's for a test

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.