The talk test can be used to measure the
A knowledge of an activity
B. intensity of an activity
C. length of an activity
D. cost of an activity
Please select the best answer from the choices provided.

The talk test can be used to measure the intensity of an activity

Option: B

Explanation:

The talk test is usually used to measure the intensity of a particular activity when a person talks during that activity. This is mostly used in cardiovascular patients to measure the intensity of the exercise.

For example, when a person can talk during exercising, it means that he is able to use the oxygen to create energy for the muscles. i.e he will be in aerobic state. Incase, he is not able to talk any more during his exercise, it means that the breathing rate has reached a particular ventilatory  threshold.

So now the body is creating energy from the stored system such as muscle glucose and creatine. Thus this talk test helps to determine in which way your body creates energy, aerobic or non aerobic.

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide