I think c is the correct answer
There’s no diagrams I would answer if I could see them
Biotic factors include plants, animals, microbes, etc. The important abiotic factors include the amount of sunlight in the ecosystem, the amount of oxygen and nutrients that is dissolved in the water, temperature, etc. Sunlight is one of the most important abiotic factors for marine ecosystems.
No, consumers help spread producers seeds so it can reproduce.