What produces most of the earth oxygen

the areas around the equator

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?

well, since there is no answer choices, i will give an answer on how it works : )

the two objects are placed together. energy will always be transferred from the hotter object to the cooler object until they are equal. hope this is close to one of the answer choices : )

answer///(c) the maximum number of organisms an environment can support for a long time; i believe this is correct, plz check luck;