Fact 1: Immunity results from immunization. Fact 2: Oxygen deprivation in immune cells causes immune weaknesses. Given the two facts above, oxygen deprivation in cells result in what?
OPTIONS:
- weakness
- strength
- Dehydration
- anemia
- oxygen
- water
- Damages them
- Pollution

Answer: weakness

Fact 1: Some animals' fur grows thicker for staying warm in the winter. Fact 2: Mammals have hair and fur. Given the two facts above, why do some animals have hair that grows longer during the winter?
OPTIONS:
- It expands
- to make braids
- to wear a scarf
- to attract mates
- When it's cold
- to stay warm
- It remains dormant
- genetic diversity

Answer: to stay warm

Fact 1: Plucking a string can cause that string to vibrate. Fact 2: Nylon string is by far the softest sound on the guitar. Given the two facts above, what do guitars make sound with?
OPTIONS:
- friction
- vibration
- voltage
- energy
- power
- bamboo
- mechanical
- heat energy

Answer:
vibration