Q: You are presented with the quiz "What is influenza caused by?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "viruses cause many human diseases" and "influenza virus causes widespread human disease". So, what's the best answer to the question?

OPTIONS:
- insects
- A bacteria
- smoking
- Mold
- Viruses
- amoeba
- Cold weather
- chemicals

A: Viruses

Q: You are presented with the quiz "What forms caverns by seeping through rock and dissolving limestone?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "acavern is formed by carbonic acid in groundwater seeping through rock and dissolving limestone" and "when carbon dioxide is in water, it creates carbonic acid". So, what's the best answer to the question?

OPTIONS:
- pure oxygen
- Something with a head, thorax, and abdomen
- basic building blocks of life
- carbon dioxide in groundwater
- magma in groundwater
- oxygen in groundwater
- At the peak of a mountain
- underground systems

A: carbon dioxide in groundwater

Q: You are presented with the quiz "what usually has clear weather" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "high pressure systems cause clear weather" and "most deserts occur in regions that typically have high atmospheric pressure". So, what's the best answer to the question?

OPTIONS:
- hurricanes
- mild
- deserts
- less water
- autumn
- swamps
- rain forests
- Winter

A: deserts

Q: You are presented with the quiz "What influences the chances of a species surviving?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "population size influences the chances of a species surviving" and "economic migration affects the population size". So, what's the best answer to the question?

OPTIONS:
- light energy
- migration
- plate tectonics
- cell division
- animals
- temperature
- environment
- erosion

A:
migration