Problem:OPTIONS:
- Calcium carbonate
- harmful substances
- volume
- precipitation
- smog
- drought
- flooding
- weathering

You are presented with the quiz "what does lack of moisture in the air cause low amounts of?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "lack of moisture in the air causes low amounts of rainfall" and "most precipitation occurs as rainfall". So, what's the best answer to the question?
****
A: precipitation

Problem:OPTIONS:
- reduced heat
- lava
- oxygen
- energy barrier
- water
- heat energy
- electricity
- energy

You are presented with the quiz "Plastic slows the transfer of" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "an electrical insulator slows the transfer of electricity" and "plastic is an insulator of electricity". So, what's the best answer to the question?
****
A: electricity

Problem:OPTIONS:
- objects that have mass
- warm-blooded
- Earth orbiting the Sun
- jellyfish
- salmon only
- bass only
- bass and salmon
- chickens

You are presented with the quiz "What have a centralized nervous system with a brain?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "fish have a centralized nervous system with a brain" and "fish include bass and salmon". So, what's the best answer to the question?
****
A: bass and salmon

Problem:OPTIONS:
- rabbit
- Power plants
- insects
- swamp vegetation
- mammals
- Shade trees
- animals
- Most plants

You are presented with the quiz "What can shed their leaves?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "plants that shed their leaves seasonally each year are called deciduous plants" and "shade trees can be deciduous". So, what's the best answer to the question?
****
A:
Shade trees