Answer:
The correct answer is "A model that connects the higher trophic levels with the ones below them".
Explanation:
In a food chain, a trophic level refers to the position at which an organism belongs respect to the start of the chain. Trophic level 1 belongs to primary producers as plants, trophic level 2 belongs to primary consumers such as herbivores, trophic level 3 belongs to secondary consumers as carnivores. A model that connects the higher trophic levels with the ones below them, would allow to establish the flow of energy in a marine ecosystem, because a food chain not only determines how organisms eat each other, but how the energy flows within an ecosystem.
