What is the main difference between cardio and strength-training activities?

a- cardio activities increase your physical strength, while strength-training activities work your heart and lungs.

b- cardio activities work your heart and lungs, while strength-training activities strengthen your muscles.

c- cardio activities require short bursts of energy, while strength-training activities strengthen your body over long durations.

d- cardio activities improve your joints' range of motion, while strength-training activities work your heart and lungs.
-if you are not 100% sure don't not answer..
you

B- Cardio activities work your heart and lungs, while strength-training activities strengthen your muscles.

Explanation:

The difference between cardio and strength exercises is that cardio exercises are weight-oriented and are good for the heart and breathing system, while strength exercises are for muscle hypertrophy - muscle growth. In addition, cardio exercises are more health-oriented, while muscle strength exercises have a more aesthetic purpose. An example of cardio exercise is running, and an example of strength exercise is bodybuilding.

i don't think so because different teachers have different materials. tehy teach differently, unless you know for sure your teacher is the exact same as others. i would just contact ur teacher