Answer:
Plants and plankton, they talk about his in the study.
Explanation:
Just did it on a p e x it is correct!
Scientists estimate that 50-80% of the oxygen production on Earth comes from the ocean. The majority of this production is from oceanic plankton drifting plants, algae, and some bacteria that can photosynthesize.
C. By plants and plankton
Oxygen Supply
Half of the world's oxygen is produced via phytoplankton photosynthesis. The other half is produced via photosynthesis on land by trees, shrubs, grasses, and other plants. As green plants die and fall to the ground or sink to the ocean floor, a small fraction of their organic carbon is buried.
Oxygen is generated during photosynthesis by plants and many types of microbes. Plants both use oxygen (during respiration) and produce it (via photosynthesis). Oxygen can also form a molecule of three atoms, which is known as ozone (O3).
To learn more about the oxygen production, refer
https://brainly.com/question/19176946
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