Which of the following are artificial aquatic ecosystems?

The Great Barrier Reef off the coast of Australia can be classified as a .......

The mass of living material at a trophic level at a particular time is called

Which of the following is the most stable ecosystem?

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.

Which of the following regulates the function of a forest?