Fact 1: Aflashlight requires a source of electricity to produce light. Fact 2: Electric power sources are ordinary batteries. Given the two facts above, what requires a battery to produce light?

Select from the following.
1). flashlight.
2). energy.
3). mirror.
4). microscope.
5). direct energy.
6). fire.
7). cactuses.
8). glowworm.
Answer:
1).