Moderate-intensity land-based exercise usually generates enough heat to maintain the body's core temperature as low as without the need for external heavy clothing
a. 10°f
b. 0°f
c. -10°f
d. -22°f

d. -22°F

Explanation:

The external temperature that the body could withsand and mantain the heat of the body´s core temperature without the need for heavy clothing, would be around -22 F, if you do moderate intensity land based exercise the heat generated by your physical activity is enough to keep your core temperature without great deal of external heavy clothing.

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