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.

Responses
A Eutrophication of the ocean leads to an increase in dissolved oxygen.Eutrophication of the ocean leads to an increase in dissolved oxygen.
B Photosynthesis by the phytoplankton increase the oxygen concentration of the ocean.Photosynthesis by the phytoplankton increase the oxygen concentration of the ocean.
C Decomposition of dead organic matter decreases the oxygen concentration in the ocean.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.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

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.