A single species of squirrel evolved over time into two species, each on opposite sides of the Grand Canyon. This change was most likely due to Select one:

Low variation in the initial population

Differences in reproductive rates

More food was found on one side

The isolation of the two groups

Carbon-14 has a half-life of 5,730 years and most igneous rock is older than that.

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.