Which organism in this food web has the greatest influence on the ecosystem?

Im going to say the zooplankton

Explanation:

Animal plankton are called zooplankton. zoopla.nkton can move on their own, but their movement is overpower by currents. zoopla.nkton may be herbivores or plant eaters, carnivores or meat eater, or omnivores, which eat both plants and animals. Decomposers break down dead plants and animals. They also break down the waste of other organisms. They are an important element in the food chain because they keep up a continuous flow of nutrients for the primary producers.