Scientists estimate that a significant portion of Earth's oxygen is produced by the ocean. What is the primary source of this oxygen?

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A Deep-sea volcanic vents.
B Oceanic plankton, algae, and certain bacteria.
C Tropical rainforests located on islands.
D The movement of tides and waves.

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Answer: B. Oceanic plankton, algae, and certain bacteria.

Explanation: Between 50% and 80% of Earth's oxygen comes from the ocean, primarily produced by photosynthesizing organisms like plankton.

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Scientists estimate that a significant portion of Earth's oxygen is produced by the ocean. What is the primary source of this oxygen?

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