12. which of the following typically occurs in the biosphere?
a. continuous circulation of hot and cold oceanic currents
b. regulation of the rate at which thermal energy leaves the planet
c. the interaction of plants and animals within specific climate regions
d. the recycling of the continental crust in subduction zones

Option (A) is the correct answer.

Explanation:

In convection oven there is circulation of hot air. Hot air expands much faster as compared to cold air.

Therefore, this due to the increase in circulation of hot air the food will get cooked or baked at faster rate.

Thus, we can conclude that out of the given options, the key difference in convection oven and a regular oven is that it circulates the hot air.