17. According to scientific evidence, which event would have been the first to occur during the formation of the Solar Systern? A collapsing cloud of gas and dust formed accretion disk around the young Sun.
A Mars-sized object collided with Earth, which led to the formation of the Moon.
A period of heavy bombardment of meteorites merged together to form the inner planets.
A cooling period occurred, which allowed for rocks on the new planets to harden.

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.