Scientists discovered that the albert's squirrels became two separate populations during the grand canyon's formation; they are now known as the albert's and kaibab squirrels.

their traits differ, and scientists agree that in the future they may no longer be able to breed with each other.

if this occurs and breeding can not happen, what will this be an example of?

a.
natural selection

b.
speciation

c.
succession

d.
spontaneous generation