Koala are a specialist species because they?

Because they only eat eucalyptus leaves. Specialist species are species that can survive in a limited range of conditions, such as diet, camouflage, climate etc. Koala bears are marsupial mammals that feed selectively on the leaves of eucalyptus trees.

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.