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About 10,000 years ago two populations of
tassel-eared squirrels were separated from
each other. Today these squirrels are so
different that they are unable to interbreed
when brought together.
2
Tassel-eared squirrel
Northern
isolation
Southern
isolation
Kaibab squirrel
Abert's squirrel
Which of the following explains this phenomenon?
A Competition
B Extinction
C Predation
D Speciation