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..
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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.

a, b, c - sides of a triangle

a + b > c

a + c > b

b + c > a

we have a = 5m and b = 11m. substitute:

5 + 11 > c

16 > c → c < 16

5 + c > 11         subtract 5 from both sides

c > 6

11 + c > 5         subtract 11 from both sides

c > -6

c < 16 and c > 6 and c > -6

thereofre your answer is 6m < c < 16m