Fact 1: Abattery converts chemical energy into electrical energy. Fact 2: Electrical energy can be converted into kinetic energy and heat energy by an electric motor. Given the two facts above, what can convert chemical energy into kinetic energy?
Available options:
1). a magnet
2). a vacuum
3). a windmill
4). a battery
5). arteries
6). barnacles
7). animals
8). engines
Answer:
4).