During resistance exercise, muscles are what?

Resistance training is any exercise that causes the muscles to contract against an external resistance with the expectation of increases in strength, tone, mass, and/or endurance. ... When you lift weights at the gym to get stronger or bigger or more toned, you are performing resistance exercise.

the answer is b i think

a) electrical > light, sound, and thermal< < < <

) the mechanical energy of the firefighter moving.< < < < a) electrical > light, sound, and thermal< < < <

c) both a and b.