Write the common food chain of a pond ecosystem.

Explanation

In a freshwater aquatic ecosystem like a pond, the following organisms are included
Producers Rooted or floating plants usually algae, called phytoplankton.
Consumers Animals of the ecosystem which depend on the producers for food directly.
Herbivores The algae are eaten up by protozoa (zooplankton).
Carnivores The protozoa are eaten up by small fish.
Higher carnivores big fishes and fish-eating bird or animal eats the small fish.
`underset(("Producer"))("Algae")tounderset(("Herbivore"))("Protozoa")underset("Pond ecosystem of food chain")(tounderset(("Carnivore"))"Small fish"to)underset(("Large carnivore"))("Large fish/bird/animal")`