#1 the water held back by a dam is an example of which type of energy?
(a) chemical energy
(b) mechanical energy
(c) kinetic energy
(d) potential energy
#2 a swinging pendulum demonstrates which type of energy?
(a) both potential and kinetic energy
(b) chemical energy
(c) only kinetic energy
(d) only potential energy
#3 how can you increase the period of a pendulum?
(a) by making the string longer
(b) by making the string shorter
(c) by taking away mass
(d) by adding mass

Fruit bats in central america eat bananas and other fruits. banana plants rely on bats for pollination. what would be the most likely consequence on the banana crop if fruit bats were eliminated from the area? the banana crop would increase because bats would stop eating the crops. the banana crop would decrease because bats would no longer pollinate the crops. the banana crop would remain constant because bees would replace the bats. the banana crop would remain constant because the plants would adapt using asexual reproduction.