Two populations that are separated by a mountain range can no longer interbreed to produce fertile offspring. this is an example of
a) allopatric speciation
b) niche speciation
c sympatric speciation
d subspecies speciation

a) allopatric speciation  

Explanation:

Allopatric speciation occurs when two populations of a species are separated by a geographical barrier. This geographical barrier, which can be a mountain, desert or forest, for example, causes a spatial separation (allopatry). In this case, we say that a geographic isolation occurred.

When these populations separate, they may undergo different pressures as they are in different areas. These pressures, over time, cause a genetic divergence and, consequently, a possible reproductive isolation. Many consider this type of speciation as the main model of speciation.

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.

bc blah

explanation:

bc blah