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:

all three options are correct

the correct answers are:

a - pacific plate;

it is the biggest oceanic tectonic plate. surrounded on all sides by continental tectonic plates, it is submerging and gradually becoming smaller and smaller.

b - north american plate;

huge continental plate, occupying big portion of the northern hemisphere.

c -eurasian plate;

alongside the north american plate, it is one of the two dominant continental plates in the northern hemisphere.

d - indian plate;

a small continental plate, that has been part of gondwanaland initially, but after the break up of it, moved towards northeast and pushed into the eurasian plate that was once part of laurasia.