Question

In the food pyramid, the greatest biomass appears at the level of A) Birds and Mammals. B) Insects and Zooplankton. C) Phytoplankton and Bacteria. D) Small Fish and other Aquatic Species

Answer 1

I think the answer should be:D) Small Fish and other Aquatic Species

In food pyramid, the biomass will be much lower in the higher level. In general, every level will have lower of mass/energy compared to the level below. Then, the greatest biomass should be found in the producer class. High-level consumer like bird or mammals should have the lowest mass. 
But it was inverted in aquatic, producer become the lowest mass so phytoplankton and zooplankton must be lowest. You should be able to exclude option A and C so it is either option B or D. Since B has zooplankton, I prefer to choose D

Answer 2

Answer:

plankton and bacteria

Explanation: