The Major Photosynthesizing Organisms in the Ocean Are Phytoplankton and Algae.These

question 48

Multiple Choice

The major photosynthesizing organisms in the ocean are phytoplankton and algae.These organisms obtain most of the CO₂ necessary for photosynthesis from which source?

• A) They take it directly from the atmosphere.
• B) They use CO₂ dissolved in ocean water.
• C) They use CO₂ respired by surrounding organisms.
• D) They break down organic molecules in the ocean.
• E) They break down carbonate from ocean sediments.

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