Make a conclusion about the similarities and differences between natural ecosystems and agroecosystems.

1) Natural ecosystems consist of a large number of species, agroecosystems (agrocenoses) – of certain that are necessary for humans.

2) In natural ecosystems, branched food chains, food webs. In agroecosystems, chains are usually short, due to the low diversity of species.

3) The circulation of substances and energy in the natural environment is closed, everything goes back to the soil. In the agrocenosis, part of the substances is withdrawn in the form of a crop, therefore the cycle is not closed.

4) The agrocenosis, due to the small number of species, is unstable and cannot exist for a long time without human intervention, a succession will occur. Natural ecosystems support themselves.