Question: Fact 1: Mammals generate heat mainly by keeping their metabolic rate high. Fact 2: All humans are mammals. Given the two facts above, what generates heat mainly by keeping their metabolic rate high?
OPTIONS:
- humans
- clouds
- rabbit
- bears
- animals
- the sun
- insects
- goats
Answer: humans

Question: Fact 1: Earthworm burrows help aerate soil, which is also good for plants. Fact 2: Most species construct burrows. Given the two facts above, what do constructions by earthworms help to do?
OPTIONS:
- compact soil
- moisten soil
- agriculture
- to move people
- relocation
- aerate soil
- survival
- dry out soil
Answer: aerate soil

Question: Fact 1: Loud noises can cause animals to startle. Fact 2: Flat spots on rail car wheels cause a loud banging noise. Given the two facts above, flat spots on rail car wheels can cause what to startle?
OPTIONS:
- animals
- water
- planes
- vehicles
- people
- nerves
- deaf people
- an object
Answer:
animals