Problem:OPTIONS:
- electricity
- kinetic energy
- temperature
- Evaporation
- salinity
- Pollution
- wind
- magnetism

You are presented with the quiz "what affects a gas?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "if gas is heated then that gas will expand" and "an increase in temperature causes a gas to expand". So, what's the best answer to the question?
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A: temperature

Problem:OPTIONS:
- rings
- fibers
- bamboo
- bark
- crown
- wind
- soil
- traits

You are presented with the quiz "What can be used to estimate a forest's growth rate?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "the number of rings in a tree trunk can be used to estimate the age of the tree" and "tree rings are examined to learn the forest age and growth rate". So, what's the best answer to the question?
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A: rings

Problem:OPTIONS:
- cows
- Whales
- force
- humans
- density
- Birds
- gravity
- dogs

You are presented with the quiz "what requires warmth for survival?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "an animal requires warmth for survival" and "cows are social animals". So, what's the best answer to the question?
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A: cows

Problem:OPTIONS:
- Weight of sun
- Temperature
- Volume of water
- Weight of moon
- Calcium carbonate
- Sound levels
- objects that have mass
- air pressure

You are presented with the quiz "What is a graduated cylinder used to measure?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "agraduated cylinder is used to measure volume of a liquid" and "typically, the liquid is water". So, what's the best answer to the question?
****
A:
Volume of water