Micro-consumers in an ecosystem can be classified into which of the following categories?

The natural reservoir of phosphorus is:

Which ecosystem does not show variations dependent upon geographic location and rainfall?

What is the full form of $PAR$?

Given below is a list of autotrophs and heterotrophs. With your knowledge about food chain,establish various linkages between the organisms on the principle of 'eating and being eaten'. What is this inter-linkage established known as?
Algae,hydrilla,grasshopper,rat,squirrel,crow,maize plant,deer,rabbit,lizard,wolf,snake,peacock,phytoplankton,crustaceans,whale,tiger,lion,sparrow,duck,crane,cockroach,spider,toad,fish,leopard,elephant,goat,nymphae,spirogyra.

The individual transitional communities in ecological succession are termed as