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: When an atom gains or loses an electron it becames a(n) ion.

SOLUTION: When an atom gains or loses an electron it becames an?

PROBLEM: Antibodies recognize and combine with harmful materials, including both toxic chemicals and invasive microorganisms.

SOLUTION:
Which proteins recognize and combine with harmful materials, including both toxic chemicals and invasive microorganisms?