The number of individuals of a species in a particular ecosystem at a given time remains constant due to
Man
Parasites
Predators
Available food
The phytoplankton in the ponds act as
Identify the possible link “$A$” in the following food chain.
Plant $→$ Insect $→$ Frog $→$ “$A$” $→$ Eagle
A food web
Energy storage at consumer level is called
The transfer of energy from organism to organism in a natural community establishes