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The evolution theories.

By the term of evolution is meant the
development of natural and social occurrence. Some negligible and invisible
changes occur evolutionary. The evolution theory gives us the explanation of
historical development of living things.  

In this assay I try to describe the
development of the main evolution conceptions from the ancient times to now
days. The beginning and development of life have always been a matter of
people’s concern and interest. Rather than the theory of evolution, we should
speak of several theories of evolution. On the one hand, this plurality has to
do with the different explanations advanced for the mechanism of evolution, and
on the other, with the various philosophies on which it is based.

Before a theory can be
included in the system of science, it must
meet all of the following criteria

its ability to explain what has been observed;

its ability to predict what has not yet been
observed; and

its ability to be tested by further
experimentation and to be modified as required by the acquisition of new data.

definitions mean that a scientific theory is not used, as people often use the
word theory, to mean a hunch or a guess. A
scientific theory is held with a high degree of confidence and is supported by
enough evidence to make its abandonment unlikely
. As new
evidence is found, a theory may be modified but only with compelling evidence,
verification and peer review.  The business of science is to build
theories that explain how the natural world works and can predict how it might
work in the future.

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