Question

question 1 of 10
which organisms produce about half of the oxygen on earth?
a. rocks
b. humans
c. aquifers
d. plankton

Explanation:

Plankton, especially phytoplankton, perform photosynthesis. Through this process, they release oxygen. They are abundant in the oceans and contribute approximately half of the Earth's oxygen. Rocks (A) and aquifers (C) are non - living and do not produce oxygen. Humans (B) consume oxygen through respiration.

Answer:

D. Plankton