A food chain is representation of what eats what in an ecosystem.
A combination of two food chains in food web are:
Example No 1:
plant———-Grasshopper——Frog——snake——bacteria
Example no 2:
Plant——-rabbits——-fox——bacteria
In a food chain,producers are usually plants and algae which are able to make their own food. Consumers feed on plants. In example no 1, grasshopper are primary consumers,frog are secondary consumers,snake are tertiary consumers.
In example no 2, plants are producers, rabbit are primary consumers and foxes are secondary consumers.
Decomposers are organisms that feed on the dead organisms in a food chain. In both the example of food chain,bacteria are the decomposers.
Seafood Watch has had an immense influence on decisions regarding illegal fishing practices and has helped design sustainable seafood environments due to their lists of seafood that should be eaten without worries.