Question: If humans generate heat mainly by keeping their metabolic rate high, then what generates heat mainly by keeping their metabolic rate high? Answer choices: - humans - clouds - rabbit - bears - animals - the sun - insects - goats
Answer: humans

Question: If constructions by earthworms help aerate soil which is good for plants, then what do constructions by earthworms help to do? Answer choices: - compact soil - moisten soil - agriculture - to move people - relocation - aerate soil - survival - dry out soil
Answer: aerate soil

Question: If flat spots on rail car wheels can cause animals to startle, then flat spots on rail car wheels can cause what to startle? Answer choices: - animals - water - planes - vehicles - people - nerves - deaf people - an object
Answer:
animals