Biology

The correct answer is Phytoplankton.

Phytoplankton are microscopic plants that live in the ocean and, like terrestrial plants, perform photosynthesis. They pull carbon dioxide (CO₂) from the atmosphere (via the ocean surface) and use sunlight to produce food in the form of glucose. This process also releases oxygen as a byproduct. Phytoplankton are a crucial part of the Earth's carbon cycle, as they serve as a primary s...