In biology development is a process of change in the inherited lines of the population of organisms from one generation to the following. Genes which are transferred organism posterity, make the inherited lines which are the development basis. Mutations in genes can make the new or changed lines in the people leading to occurrence of hereditary distinctions between organisms, but new lines also arrive from transfer of genes between settlements, as in moving, or between versions, in horizontal gene transfer. In versions which reproduce sexually, new combinations of genes are made by a genetic recombination which can increase change in lines between organisms. Development occurs, when these hereditary distinctions are extended more or become rare in the population.

There are two main mechanisms of development. The first is a natural selection, the process causing hereditary lines which are useful to a survival and reproduction. It occurs, because people to favourable lines, more possibly, will reproduce descendants that there are more than people in following generation has inherited these lines. Over many generations adaptation occurs through a combination of consecutive, small, casual changes in lines, and natural selection of those variants in separate conditions of environment. The second is the genetic drift, independent process which causes casual changes in frequency of lines in the population. Genetic drift follows from games of probability of a role in, whether there will be a given line is transferred, as people worry and reproduce. Though the changes caused in any generation by drift and a choice, are small, distinctions collect with each subsequent generation and can, during long time, cause essential changes in organisms.

One definition of a version - the group of organisms which can reproduce with each other and makes fertile posterity. When the version is divided into settlements with which interfere to be crossed, mutations, genetic drift, and natural selection causes accumulation of distinctions about generations and occurrence of new versions. The general lines between organisms assume, that all known versions occur from the general ancestor (or a hereditary genofund) through this process of a gradual divergence.

The evolutionary biology documents the fact, that development occurs, and also develops and checks theories which explain its reasons. Researches of the report of a fossil and a variety of living organisms have convinced the majority of scientists to the middle of the nineteenth century, that the given version changes during long time. However, the mechanism, stimulating these changes, remained not clear till 1859 when was issued Charles's Darwin's publications About an origin of the versions, detailing the theory of evolution of natural selection. Work of Darwin has soon led to overwhelming acceptance of development within scientific community. In 1930 years darwinian natural selection has been united with Mendelevsky inheritance to generate modern evolutionary synthesis in which communication between units developments (genes) and the development mechanism (natural selection) has been made. This strong explanatory and predicting theory directs research, constantly bringing up new questions, and it became the central principle of the organisation of modern biology, providing an explanation of association of a variety of a life on the Earth.

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