TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Ecological pyramids can demonstrate the decrease in energy, biomass or numbers within an ecosystem.

SOLUTION: What can demonstrate the decrease in energy, biomass or numbers within an ecosystem?

PROBLEM: Carried through body happens if cancer cells enter the blood stream.

SOLUTION: What happens if cancer cells enter the blood stream?

PROBLEM: The motor system consists of neurons that carry signals to skeletal muscles.

SOLUTION:
What system consists of neurons that carry signals to skeletal muscles?