Question

Which of these statements describes an accurate model for how carbon dioxide and oxygen levels change within the ocean over time? Choose the TWO answers that apply.

A) Eutrophication of the ocean leads to an increase in dissolved oxygen.
B) Photosynthesis by the phytoplankton increase the oxygen concentration of the ocean.
C) Decomposition of dead organic matter decreases the oxygen concentration in the ocean.
D) Cellular respiration by primary consumers increases the oxygen concentration in the ocean.
E) Anaerobic respiration at the ocean floor decreases the carbon dioxide levels in the ocean.

Answer 1

B) Photosynthesis by the phytoplankton increases the oxygen concentration of the ocean.

C) Decomposition of dead organic matter decreases the oxygen concentration in the ocean.

Step-by-step explanation:

The ocean's carbon dioxide and oxygen levels change due to biological processes. Phytoplankton, through photosynthesis, increase the oxygen concentration in the ocean. However, the decomposition of dead organic matter decreases the oxygen concentration as it consumes oxygen in the process.