In the nature everything is interconnected among themselves. Animals and plants are links of one chain, a uniform circle of life. The main function of plants is release of the substances of the organic nature which are formed at absorption of water and salts, solar energy and carbon dioxide. It is difficult to overestimate value of animals in the nature – without them the mother nature just will not survive!
Instruction
1. The most important purpose of animals in the nature – participation in circulation of substances without which any organism on Earth could not survive. Considering an ecosystem of animals, biologists divide a complex of organisms into three groups. So-called producers – the green plants creating organic matter from inorganic enter into the first group. Konsument – the animals eating various plants or animal food enter into the second group. They overwork, and then and disseminate to the soil (and in its surface) substances of organic origin. The third group is made by redutsenta – the bacteria and mushrooms turning all organic chemistry which appears by means of activity of plants and animals, in mineral salts and gases.
2. Curiously, as gases, and salts which are turning out due to activity of organisms can be reused by leaves and roots of various plants. And circulation of substances and energy in the nature turns out, impossible without activity of animals. In turn, animals perform several main functions necessary for maintenance of life in an ecosystem.
3. First, any animal is directly involved in circulation of various substances and chemical elements. Secondly, living beings, without suspecting that, play a large role in formation of soils. Especially well invertebrate creations (ticks, mollusks, earthworms, insects) cope with this role. It is noticed that the plant layer of Earth well develops where such organisms are found in the soil.
4. Thirdly, many animals and birds are engaged in extermination of impractical and sick animals and plants. For example, the second name of a wolf – the hospital attendant of the wood. These predators exterminate sick animals, without allowing a potential infection to extend in the nature. Egyptian vultures eat drop, than render the invaluable help to all ecosystem. Without noticing that, animals become rulers of the destiny of the mother nature and her children. All this leads to natural selection and also to maintenance of viability of plants.
5. Fourthly, predatory and parasitic beings constrain reproduction of herbivorous animals. The fact is that the surplus of herbivorous will lead to the fact that the lion's share of terrestrial vegetation will be destroyed, and it can already cause a lack of oxygen on the planet. And insectivorous birds constrain population of mean insects who lead to destruction of certain plant species.
6. Fifthly, animals carry out cross-pollination of almost all species of angiospermous plants. Besides, they extend seeds of trees and bushes. For example, the bees living in steppes, in savannas, in mountains take part in pollination, and such animals as granivorous birds, rodents, hoofed, etc. carry seeds.
7. Certainly, the value of animals in the nature is high, but, unfortunately, now there are practically no such beings to whom extinction because of the person would not threaten. For this reason the main objective of mankind is preservation of all animal species and natural balance.