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

Warm and humid temperature and moisture conditions describe an air mass that originates over the atlantic ocean near the equator.
Which temperature and moisture conditions describe an air mass that originates over the Atlantic Ocean near the equator?

The values of strangeness assigned to various particles are based on decay systematics.
The values of strangeness assigned to various particles are based on what?

The values of independent variables are controlled by the experimenter over the course of an experiment.

The values of which factors are controlled by the experimenter over the course of an experiment?