In the past, human populations were controlled by: a. wolves and coyotes b. disease and famine c. disease and pollution d. producers and consumers

Since pollution inexsitent and wolves, coyotes, producers and consumers can't interfere in human population, the answer is B.

Only hunger and diseases could control human population.

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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.