input: OPTIONS:
- heat gradient
- distance gradient
- temperature volatility
- temperature gradient Now, answer this question: Q: What is the term for the change in temperature with distance? A:
A:
output: temperature gradient

Q: A type of what in a cow's gut enables the animal to digest grass? A:

OPTIONS:
- virus
- pests
- algae
- bacteria

Answer: bacteria

Problem: OPTIONS:
- same size
- zygote
- human sperm
- human egg
Q: Q: Which is larger: the human sperm or the human egg? A:
Answer: human egg

Problem:OPTIONS:
- kidney
- pancreas
- heart
- liver

Q: What organ creates bile? A:
****
A: liver

Q: What do you call the regular changes in biology or behavior that occur in a 24-hour cycle? A:
OPTIONS:
- cognitive rhythms
- variable rhythms
- sleep rhythms
- circadian rhythms
circadian rhythms

Q: What do you call the heat below earth's surface that can be used to produce electricity? A:
OPTIONS:
- inert energy
- renewable energy
- natural energy
- geothermal energy

Answer:
geothermal energy