Problem: OPTIONS:
- predators
- precipitation
- UV light
- extreme heat
Q: Q: Lodgepole cones remain closed until exposed to what? A:
Answer: extreme heat

Problem:OPTIONS:
- in the afternoon
- all day
- in the morning
- at night

Q: When is melatonin secreted? A:
****
A: at night

Q: Which factor has a big impact on coastal climates? A:
OPTIONS:
- ocean waves
- tsunami
- tide
- large ocean currents
large ocean currents

Q: Ionic liquids heating a salt to its melting point produces a what? A:
OPTIONS:
- table salt
- plasma
- gas
- molten salt

Answer: molten salt

Question: Q: Heterotrophic organisms use organic compounds, usually from other organisms, as a source of what basic element of life? A:
OPTIONS:
- oxygen
- monoxide
- hydrogen
- carbon
Answer: carbon

input: OPTIONS:
- biochemistry
- chemistry
- biology
- stratigraphy Now, answer this question: Q: What is the study of rock strata called? A:
A:
output:
stratigraphy