Question

american alligator → carp → insects → mangrove; about 10 percent of the energy in one trophic level is transferred to the next trophic level.
egret → carp → insects → sawgrass; about 90 percent of the energy in one trophic level is transferred to the next trophic level.
mangrove → insects → carp → egret → american alligator; about 10 percent of the energy in one trophic level is transferred to the next trophic level.
sawgrass → insects → southern leopard frog → raccoon → american alligator; about 90 percent of the energy in one trophic level is transferred to the next trophic level.

Explanation:

Step1: Analyze the food web direction

In a food web, energy flows from producers to consumers. Producers (like mangrove, sawgrass) are at the start.

Step2: Check energy transfer percentage

Energy transfer between trophic levels is approximately 10% (not 90%).

Answer:

Mangrove → insects → carp → egret → American alligator; about 10 percent of the energy in one trophic level is transferred to the next trophic level.