The diagram shows the trophic levels in a lake on a farm
Large-Sized
Fishes
Fishes, Crabs
(Larvae)
Zooplankton
Diatoms/Algae
Suppose the farmer sprays a field with a
chemical fertilizer. Based on the flow of energy in
the lake, which organisms would contain the
highest concentration of the chemical fertilizer?
A diatoms and algae
B. zooplankton
C. fishes and crabs
D. large-sized fishes

D. large-sized fishes

Explanation:

The energy flow in the trophic level from highest to lower level is as follows:

Large-Sized  Fishes  => Fishes and Crabs  (Larvae)  => Zooplankton  => Diatoms/Algae.

The concentration of toxics or chemical substance increases from lower level (primary producers) to highest level, so the organism at apex contain highest concentration of chemical fertilizer.

In this example, large-sized  fishes have highest concentration of chemical fertilizer.

Hence, the correct answer is D. large-sized fishes.

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.