Which marine ecosystem has the fewest available nutrients and the lowest productivity? a) estuaries b) open ocean c) coral reefs d) continental shelf

B)open ocean

Explanation:

The open ocean ecosystems have the least available nutrients and lowest productivity. The limiting factors in an marine habitat are light and nutrients. Coastal ecosystems, estuaries and coral reefs have much higher nutrient availability and high productivity because plants are in shallow water and receive plenty of sunlight.