Q: You are presented with the quiz "Many muscle fibers contracting at once can be induced by" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "shivering occurs when many muscles contract a little bit all at once" and "another response to cold is shivering". So, what's the best answer to the question? | OPTIONS:
- exposed genitalia
- exposure to heat
- sweating
- exposed biceps
- mechanical waves
- Electrical energy
- exposure to cold
- Veins and arteries.
A: exposure to cold

Q: You are presented with the quiz "What impact does incineration have?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "pollutants have a negative impact on the environment" and "incineration is harmful to the environment, it pollutes". So, what's the best answer to the question? | OPTIONS:
- heat
- neutral
- friction
- mechanical
- harmful
- good
- ligt
- positive
A: harmful

Q: You are presented with the quiz "What provides animals with protection against the weather?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "shelter is used for protection by animals against weather" and "trees provide shelter and food for animals". So, what's the best answer to the question? | OPTIONS:
- Trees
- skin
- leaves
- Rain
- Flowers
- fibers
- wetland
- Fruits
A: Trees

Q: You are presented with the quiz "What are used for moving people?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "aairplane is used for moving people across bodies of water" and "first jet airplane takes flight". So, what's the best answer to the question? | OPTIONS:
- jets
- wind
- motors
- the Moon
- rats
- cars
- rice grains
- Lift
A: jets