instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Pyramid ecosystem is used to show energy flow through the trophic levels.
answer:
What is used to show energy flow through the trophic levels?


question:
The long, threadlike extensions of the nerve cell help transmit nerve impulses.
answer:
Which part of the nerve cell helps transmit nerve impulses?


question:
What's the term for the gradual progression from simple plants to larger more complex ones in an area?
answer:
What's the term for the gradual progression from simple plants to larger more complex ones in an area?