The transfer of energy from organism to organism in a natural community establishes
Food chains
Biological control
Natural barriers
All the above
In ecological pyramid the base always represent the $...A...$ and the apex represents $...B...$ Here $A$ and $B$ represents
The green plants are removed from an aquarium
Which of the following are consumers of second order
Which one of the following has the largest population in a food chain?
In a pond ecosystem, benthos means