Food chains always start with which kind of organism? Question 3 options: Decomposer Consumer Carnivore Producer

Producers!

Explanation:

Autotrophs are the foundation of every ecosystem on the planet. That may sound dramatic, but it's no exaggeration! Autotrophs form the base of food chains and food webs, and the energy they capture from light or chemicals sustains all the other organisms in the community. When we're talking about their role in food chains, we can call autotrophs producers.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."