Question

kaibab squirrels live on the north side of the grand canyon and are a subspecies of aberts squirrel, a species found only on the south side of the grand canyon. presumably, kaibab squirrels were prevented from breeding with aberts squirrels when the grand canyon became too deep to be crossed by squirrels. if correct, this would be an example of

allopatry.

apatheticity

sympatry

amphipathy

Explanation:

To solve this, we analyze each term:

• Allopatry: Occurs when a geographic barrier (like the Grand Canyon here) separates populations, preventing gene flow. Kaibab and Abert's squirrels are separated by the Grand Canyon, so this fits.
• Apatheticity: Not a term related to speciation or population separation.
• Sympatry: Populations live in the same area but don't interbreed (no geographic barrier), which is not the case here.
• Amphipathy: Refers to molecules with both polar and non - polar parts, irrelevant to this context.

Answer:

A. allopatry