Whale is
Primary producer
Carnivorous, secondary consumer
A decomposer
Herbivorous
Energy enters in ecosystem through
The bacteria which attack dead animals are
We refer to the following as the food chain
Choose correct answer.
$(1)$ Zooplanktons are primary producers in an aquatic ecosystem.
$(2)$ Decomposition is largely an oxygen requiring process.
$(3)$ In a natural ecosystem, fishes, wolf, etc. are carnivore.
$(4)$ The amount of energy decreases in each successive trophic level.
The phytoplankton in the ponds act as