Question: You are presented with the quiz "Birds do what using the feathers that help them to fly?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "feathers help birds fly and provide insulation" and "to survive the chill, warm-blooded penguins rely on feathers and fat for insulation". So, what's the best answer to the question?
OPTIONS:
- to move people
- running and lifting
- survive the chill
- during the day
- Move to another area
- Earth orbiting the Sun
- to stay warm
- supersonic
Answer: survive the chill

Question: You are presented with the quiz "Chemical weathering causes what in rock to oxidize?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "chemical weathering causes iron in rock to oxidize" and "fe is the periodic symbol for Iron". So, what's the best answer to the question?
OPTIONS:
- Fe
- tar
- h2o
- H20
- DDT
- Ag
- O
- CO2
Answer: Fe

Question: You are presented with the quiz "what causes acid rain?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "the emission of sulfur dioxide causes acid rain" and "the sulfur dioxide is converted into sulfuric acid". So, what's the best answer to the question?
OPTIONS:
- gases
- rainfall
- Pollution
- fossil fuels
- emissions
- vehicles
- burning
- wind
Answer:
emissions