input: OPTIONS:
- heat energy
- erosion
- energy
- friction
- flooding
- squeeze
- contamination
- vibration Now, answer this question: Fact 1: Hitting an object causes the particles in that object to vibrate. Fact 2: Rock particles vibrate back and forth. Given the two facts above, hitting a rock causes what?
A:
output: vibration

Fact 1: Active immunity results when an immune response to a pathogen produces memory cells. Fact 2: Memory cells persist in the circulation for decades. Given the two facts above, what can persist in the circulation for decades?

OPTIONS:
- active immunity
- density
- Veins and arteries.
- oxygen cells
- bacteria
- chlorofluorocarbons
- fur and fat
- Chemical energy

Answer: active immunity

Problem: OPTIONS:
- mussels
- melting
- freezing
- fertilization
- storms
- boiling
- engines
- condensation
Q: Fact 1: Melting means changing from a solid into a liquid by adding heat energy. Fact 2: Ice is the solid form of water. Given the two facts above, what changes ice to water by adding heat energy?
Answer: melting

Problem:OPTIONS:
- Damages them
- It decreases
- death and devastation
- Increase human wealth
- Rob humans of nutrients
- Cause humans happiness
- Destroy crops
- Give humans pleasure

Fact 1: Changes in the pH of soil can cause plants to die. Fact 2: Animals and humans eat plants for their nutrients. Given the two facts above, what can changes in soil pH do?
****
A: Rob humans of nutrients

Fact 1: Blood pH may become unbalanced if the rate of breathing is too fast or too slow. Fact 2: Mammals breathe with lungs. Given the two facts above, what may become unbalanced if the lungs are working too fast or too slow?
OPTIONS:
- Decibels
- hair on head
- air pressure
- gasoline levels
- Acids
- energy usage
- brain chemistry
- blood pH
blood pH

Fact 1: The looseness of soil increases the amount of oxygen in that soil. Fact 2: Cultivation is easier if soil is loose. Given the two facts above, what kind of soil is easier to cultivate?
OPTIONS:
- looser
- cactuses
- Sediment
- sandier
- Tropical
- tighter
- alluvial
- wetter

Answer:
looser