Explain the reasons for the sustainability of oak groves.

1) species diversity: the biocenosis of oak groves is more than a hundred species of plants and several thousand species of animals; the formation of tiers of the forest;
2) high biological productivity of oak groves;
3) branched chains and food networks: the richness and diversity of plants is the reason for the development of numerous consumers from the animal world (herbivorous, carnivorous). All species serve as a food source and habitat for numerous parasitic organisms (external and internal). The loss of any one species of animal does not significantly violate the entire system;
4) a closed cycle of substances: high productivity of plants leads to the formation of leaf litter. With litter, most of the minerals and nitrogen consumed by plants are returned to the soil.

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