Various roles played by decomposers in the ecosystem are:
i. They decompose biodegradable substances into useful substances. Decomposers feed on dead things.
ii. They release nutrients into soil by decomposing dead and decaying matter, thus making the soil fertile.
iii. They maintain the nutrient pool by returning back the nutrients in the pool.
The names of aquatic organisms in order to form a food chain of at least 3-steps are as follows:
Phytoplankton → Zooplankton → small fish→ big fish
Phytoplanktons are the producers, Zooplanktons are the primary consumers which are mainly herbivores, small fishes are the secondary consumers and big fishes are the tertiary consumers which are mainly omnivores.
