Select the correct answer.
which term defines a well-tested, scientifically supported statement that explains how something works?

The term is called a theory.

In scientific investigation, a theory is a well substantiated explanation of how a particular phenomenon works based on the set of facts which had been repeatedly confirmed through observations and experiments. A scientific theory gives reliable account of a phenomenon.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.