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As cold, briny water from the antarctic circulates to the equator, it warms and rises. as it does, this upwelling carries nutrients that produce ____ billion tons of phytoplankton that are eaten by fish and birds. those that are not eaten die, and fall back to the ocean floor, carrying nutrients with them.

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Diatonic254
The answer is one (1) billion tons of phytoplankton at any one time. Annually, its recorded that there is approximately 45 billion tons of phytoplankton in the ocean. Other than being a source of food for fish, they are critical in the carb9n cycle. This phytoplankton incorporates 45–50 billion tons of inorganic carbon into their cells and are the largest source of atmospheric oxygen.
saadhussain514

45 Billion Phytoplankton

Brackish water is water that has extra salt than original water. This may appear from the crossing of seawater by fresh water that may occur in brackish specimen aquifers.  The nutrients that produce 45 billion ton phytoplankton. The phytoplankton is bacteria that is a significant autotrophic element of the plankton community and a fundamental component of water that basin ecosystems. Though it is an essential source of food for larger animals as being the first form of food chain.