Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Deletions remove one or more nucleotides from the dna
Deletions remove one or more what from the dna?

Stirring, surface area, and temperature affect the rate at solute dissolves what occurs.
Stirring, surface area, and temperature affect the rate at which what occurs?

A primary role of decomposers in an ecosystem is that they cycle matter by returning carbon and other matter to the ecosystem.
What is a primary role of decomposers in an ecosystem?