Which is most likely to happen to a population that becomes anatomically isolated from the rest of its species?

the entire species will become extinct.
the population will become a separate species over time.
the population will breed with a different species nearby.
the entire species will continue to have viable offspring together.

When a population is anatomically isolated from the rest of its species most likely The population will become a separate species over time When a population is isolated from the rest of its species, that population won't be crossbreeding with other organism that does not belong in their population group. Overtime, this population will maintain their characteristics while the others started to change.

This type of galaxy is an approximately ellipsoidal shape and a smooth, nearly featureless image. they are the largest single star systems, in the universe and are built by the collisions of many smaller galaxies.

Your weave is crusty