Within a particular population, darkly colored rats are more likely to survive than more lightly colored individuals. this situation is likely to result in a. directional selection. b. stabilizing selection. c. disruptive selection. d. balancing selection.

a. directional selection

Explanation:

Directional selection is a type of natural selection wherein one extreme trait is favored and the individuals with that extreme trait are at survival and reproductive advantage.  

In the given example, dark-colored rats are favored by natural selection over the light-colored rats. This occurs because the rats with dark skin color have better survival rats in the prevailing surrounding. Since one extreme trait (dark skin color) is favored over the other (light skin color), the rat population is undergoing directional selection.  

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.

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