The theory states that the moon formed as the result of a collision between earth and a mars-sized object.

a. great extinction
b. big bang
c. big crunch
d. giant impact

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.

Centriole.centrioles are present in animal cells but are usually absent in plant cells.

The direction a chemical reaction occurs is represented by an arrow 

Idon’t know i’m just trying to get points to make me look smawt