You are presented with the quiz "Gases from burning coal and and oil dissolving in the atmosphere can cause what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "gases from burning coal and oil dissolving in water in the atmosphere causes acid rain" and "acid rain comes from polluted clouds". So, what's the best answer to the question?

OPTIONS:
- polluted rain
- disease
- humidity
- thunderstorms
- snow
- contamination
- Temperature
- harmful substances

Answer: polluted rain

You are presented with the quiz "Which animal requires great amounts of water to survive?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "an aquatic animal requires great amounts of water to survive" and "beavers are primarily aquatic animals". So, what's the best answer to the question?

OPTIONS:
- amphibians
- Frogs
- bullfrogs
- Beavers
- Jellyfish
- mussels
- trout
- sharks

Answer: Beavers

You are presented with the quiz "What process creates sand?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "the surface of a beach is formed by mechanical weathering" and "beaches Anymore Sand is one of the most common materials on the earth's surface". So, what's the best answer to the question?

OPTIONS:
- Water expanding
- beach
- evaporation
- friction
- silicon dioxide
- weathering
- dunes
- rainfall

Answer: weathering

You are presented with the quiz "What relies on a relatively narrow range of something you can measure with paper strips?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "all life relies on a relatively narrow range of pH, or acidity" and "acidity is measured with a pH meter or with pH paper strips". So, what's the best answer to the question?

OPTIONS:
- Length
- voltage
- all life
- mammals
- humans
- Most plants
- agriculture
- animals

Answer:
all life