A person's "VO2 max" is the maximum:.
a. velocity on a treadmill test.
b. intake of air at 70% physical exhaustion.
c. intake of oxygen while at rest.
d. rate of oxygen consumption.
e. speed of oxygen exchange in the lungs.

Option D.

Rate of oxygen consumption.

Explanation:

Volume of oxygen used or Vo2 Max is the maximum ability of a person to consume oxygen and the ability of the heart, lungs and blood to transport the oxygen to other tissues and utilize it to produce ATP or energy during intense exercise.

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primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs