Q: Fact 1: When an animal moves , chemical energy is converted to mechanical energy. Fact 2: Manatees are slow moving animals. Given the two facts above, what do manatees convert into mechanical energy?

OPT: 1). major threat to health; 2). chemical energy; 3). direct energy; 4). electrical energy; 5). objects that have mass; 6). fossil fuels; 7). photosynthesis; 8). adding heat;
A:
2).