As was the development of living nature

All modern living beings, from microbes to man, is far more complex than a simple protein clumps. In the basis of the complex structure lie cells.
When examined under the microscope different tissues of plants and animals, you can see that they are composed of tiny cells, which and was called cells. The cells of each tissue similar to each other, but not like cells in other tissues. Especially arranged a kind of nerve cell. From microscopic ball representing her body in all directions depart subtle processes, fiber. Fiber different cells are connected, and therefore, the signals from one cell may be transferred to another.
No matter how different from each other different cells of animals and plants, they are mostly constructed in the same manner, having: 1) the cytoplasm (the bulk of the cell), 2) kernel (dense particle, lying in the cytoplasm), 3) the shell.
Cell theory of the structure of organisms was created in the 30s of the last century, M Schleiden and So Schwannomas. According to Engels, this theory was one of the three great discoveries of the last century, to understand the interconnection of natural phenomena. Indeed, the commonality of the structure of all living beings showed their relationship, their common origin. This was the basis for another great discovery - final justification Including Darwin's evolutionary theory.
This theory is proved that all animals and plants appeared in the result of long development from the few of the simplest organisms, consisting of one cell and similar to modern microbes.
For millions of years that have passed since the emergence of the first cell, during the evolutionary process through a series of innumerable transitional forms - there are modern, such complex living beings. We do not have the opportunity to review in detail here all stages of development. Will review only, in what directions is the development was.
The first living beings could be used to his exchange with the environment only organic compounds dissolved in the primary water of the ocean. However, in the future, thanks to the emergence of a special enzyme body - chlorophyll - some of the cells had the opportunity, using the energy of sunlight, to create complex organic compounds from carbon dioxide and water (this process is called photosynthesis). These cells, and gave rise to the vegetable Kingdom. Other cells continued to eat organic substances. However, the number of the latter in the primary water of the ocean was miserable, and when the metabolism of complex protein formations, and then cells was quite intensive, it took them many times more food. To survive in these conditions could only those cells that have acquired the ability to eat other living creatures and plants. Thus arose the animal Kingdom.
Currently, animal and man, depend on plants. Plants create all new quantities of organic substances. In addition, during photosynthesis they release oxygen into the atmosphere. Animals are forced to eat plants or each other, because the need of ready organic compounds; in addition, they are evolved by plants oxygen. If the Kingdom of plants died, modern animals and people also could not exist.