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

SOLUTION: What is used to show energy flow through the trophic levels?

PROBLEM: Fires, mainly caused by lightning, are a natural disturbance in temperate grasslands.

SOLUTION: Fires, mainly caused by what, are a natural disturbance in temperate grasslands?

PROBLEM: The body's second line of defense against pathogens includes inflammatory response.

SOLUTION:
The body's second line of defense against pathogens includes which response?