Each of them inhabit its inhabitants.For example, only in the desert meet the saiga, gopher, feather or Kipchak.Forest animals are unlikely to see the ocean and marine fish can not live in a freshwater lake.Each animal species adapted to living in certain natural community.There he finds enough food, and the conditions for normal life.Communities - not casual education.Living beings and their environment are a constant exchange of matter and energy.They supply each other practically everything necessary for life.Interaction types ensures optimum use of community resources, limiting the uncontrolled multiplication of various organisms.Destroying handica
pped, sick animals, predators contribute to a healthier population.Thereby forming a special living system with its own structure, relationships, development and function.The amounts of matter and energy necessary for living organisms are extremely high.Absorbed from the environment constantly nutrients are returned as a result of the activity of organisms.They undergo various transformations, since the break down into simpler compounds.As such, they can be absorbed by plants.That is, there is a sustainable material cycle.Each natural community is characterized by a certain set of species.The favorable environmental conditions of the area, the richer species composition inhabiting it.For example, rich wildlife and lush vegetation of the tropics is incomparable with uniform flora and fauna tundry.Takie communities are not isolated, they interact with others, forming a holistic system with a higher level of the organization - the ecosystem.All natural ecosystems are interconnected and form a living shell of the Earth - the biosphere.