Question

the grand canyon divides a lizard population into two physically isolated populations. this is an example of what type of speciation?
a a and b
b allopatric
c sympatric
d generic

Explanation:

Allopatric speciation occurs when a physical barrier divides a population, preventing gene - flow. Here, the Grand Canyon acts as a physical barrier to the lizard population. Sympatric speciation occurs without physical separation. "Generic" is not relevant in this context.

Answer:

B. allopatric