input: OPTIONS:
- it keeps an organism warm
- salt and water.
- granite
- magnesium
- gastropod shells
- ocean water
- calcium carbonate
- zinc Now, answer this question: You are presented with the quiz "A reef is made of" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "many corals secrete an exoskeleton that builds up to become a coral reef" and "coral is calcium carbonate with a trade of carotene". So, what's the best answer to the question?
A:
output: calcium carbonate

input: OPTIONS:
- a solute
- calcite
- weathering
- graptolites
- salinity
- rainfall
- movement
- thrust Now, answer this question: You are presented with the quiz "Sedimentary rocks are formed by " But you don't know the answer, so you turn to your teacher to ask for hints. He says that "sediment is formed by weathering" and "sedimentary rocks are made from sediment". So, what's the best answer to the question?
A:
output: weathering

input: OPTIONS:
- making tables
- chopping down
- planting
- watershed
- earth
- bloom time
- growth
- timbering Now, answer this question: You are presented with the quiz "doing what with trees has a positive impact on habitats" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "planting trees has a positive impact on an ecosystem" and "an ecosystem contains many habitats". So, what's the best answer to the question?
A:
output:
planting