Answer;
A. high phytoplankton turnover rate
Explanation;
-Pyramid of biomass  is a diagrammatic representation of the amount of organic material, measured in grams of dry mass per square meter (g m–2), found in a particular habitat at ascending trophic levels of a food chain.
The pyramid of a biomass in ocean inverted because:
- Food chain in ocean - {Phytoplankton → zooplankton → predatory fish.}
- The biomass of zooplankton is greater than phytoplankton (the producer ) because of their small size and low weight . The predatory fish is much larger than zooplankton .
- The producer in ocean or aquatic ecosystem producers are phytoplankton have short life span and turn over and have lower mass than zooplankton .
- The biomass of tropic level depends on the longevity of member
