Aregion’s photosynthetic productivity is influenced most significantly by
a. availability of nutrients and amount of solar radiation.
b. mean temperature and maximum depth.
c. the type of organisms that live there.
d. distance from the intertidal zone and average depth.

A region's photosynthetic productivity is influenced most significantly by : A. Availability of nutrients and amount of solar radiation

Photosynthetic productivity  cannot happen without enough nutrients and radiation. In this photosynthetic productivity, the plants will process the nutrients it gathered and process it into producing its own food

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Abay where the river empties into the sea

Iwolud you, but i dont know what you are asking.