If both bats and dolphins had to wait for the echo of a click to come back before sending out the next one and a bat and a dolphin were both echolocating on something 5 meters away, which would have a shorter ICI? Why?

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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.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.