Answer the following question: Fact 1: When an animal moves , chemical energy is converted to mechanical energy. Fact 2: Bats are animals that fly around at night. Given the two facts above, what is converted into mechanical energy when bats fly?

pick from the following.
(1). batteries;
(2). chemical energy;
(3). adding heat;
(4). electrical energy;
(5). objects that have mass;
(6). mechanical waves;
(7). electricity;
(8). direct energy;
Answer:
(2).