The diagram shows a generalized cross section of the marine environment with various zones labeled with letters. Choose the letter that best answers the question. Letters may be used once, more than once, or not at all.

-Which zone produces the most global oxygen gas?
A) A
B) B
C) C
D) D
E) E

Question

The diagram shows a generalized cross section of the marine environment with various zones labeled with letters. Choose the letter that best answers the question. Letters may be used once, more than once, or not at all.
 
-Which zone produces the most global oxygen gas?
A) A 
B) B 
C) C 
D) D 
E) E

Quizplus · Accepted Answer

The correct answer is B because the majority of Earth's oxygen comes from the ocean, specifically from the phytoplankton living near the surface. These microscopic organisms perform photosynthesis, absorbing carbon dioxide and releasing oxygen, much like plants on land.

The Diagram Shows a Generalized Cross Section of the Marine