Q: You are presented with the quiz "What happens to salt in seawater as it freezes at the freezing point?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "adding salt to a solid decreases the freezing point of that solid" and "when seawater freezes, salt is expelled from the solid in a concentrated salt solution called brine". So, what's the best answer to the question? | OPTIONS:
- vaporization
- boiling
- expelled
- salinity
- evaporation
- less water
- water vapor
- Temperature
A: expelled

Q: You are presented with the quiz "what do zooplankton feed on?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "zooplankton are tiny animals that feed on phytoplankton" and "minute plants are known as phytoplankton". So, what's the best answer to the question? | OPTIONS:
- whales
- weathering
- Energy.
- minute plants
- Chlorophyll
- an organism's body
- Germy surfaces
- humans
A: minute plants

Q: You are presented with the quiz "Hay fever is caused by " But you don't know the answer, so you turn to your teacher to ask for hints. He says that "plant reproduction often requires pollen" and "hay fever is caused by an allergy to pollens or moulds". So, what's the best answer to the question? | OPTIONS:
- one celled organisms
- bacteria
- viruses
- chemical messengers
- carbon
- heat energy
- plant reproduction
- single-celled organisms
A: plant reproduction

Q: You are presented with the quiz "Earthworm burrows help aerate soil, which is essential for what?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "earthworm burrows help aerate soil, which is also good for plants" and "good drainage is essential for growing plants in containers". So, what's the best answer to the question? | OPTIONS:
- making plants
- agriculture
- potting plants
- Exfoliation
- watering plants
- growing plants
- important habitats
- food and shelter
A: growing plants