Which of the following is not a challenge of life on land?
a. toxic effects of oxygen
c. energy demands of walking
b. variable air temperature
d. moisture loss

Eventually, these heat loss mechanisms increase sufficiently to balance ... In the 10°C environment, the large skin-to-ambient temperature gradient ... Papers Reporting the Effect of Heat on Metabolic Rate During Exercise ... If sweat loss is not fully replaced, the individual's total body water will be decreased (dehydration).

Explanation:

a. themes: sub fields

answer biscay bay;