Fact 1: Muscle contraction occurs when muscle fibers get shorter. Fact 2: Muscle activation is a prerequisite for muscle contraction. Given the two facts above, what happens to fibers after muscle activation?

OPTIONS:
- It expands
- Localized damage
- It decreases
- get shorter
- they bend
- rapid expansion
- sweating
- movement

Answer: get shorter

Fact 1: Many corals secrete an exoskeleton that builds up to become a coral reef. Fact 2: An exoskeleton is an external framework. Given the two facts above, what do many corals secrete that build up to become a coral reef?

OPTIONS:
- an external framework
- The area was once underwater
- that material's properties
- bioaerosols
- water
- dust
- after too much water received
- oxygen

Answer: an external framework

Fact 1: Aflashlight converts chemical energy into light energy. Fact 2: Ajoule is roughly the energy used by a flashlight turned on for one second. Given the two facts above, what is converted in a flashlight?

OPTIONS:
- hydrogen and oxygen
- adding heat
- an electron lens
- hydrogen to water
- chemicals to light
- batteries into solar
- heat into light
- chlorofluorocarbons

Answer: chemicals to light

Fact 1: An electron microscope is used for seeing very small objects by making them appear bigger. Fact 2: Electron microscopes use a beam of electrons as their source of illumination. Given the two facts above, what are used to illuminate small objects to look larger?

OPTIONS:
- Minerals
- Elements
- mirrors
- Neon
- photons
- satellites
- Electrons
- Light

Answer:
Electrons