Question

define evolution???

Answer 1

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the process by which different kinds of living organism are believed to have developed from earlier forms during the history of the earth.

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Answer 2

$\huge {\bf{\red{Evolution}}}$

Most life forms have arisen by an accumulation of changes in body design that allow the organism possessing them to survive better. These changes are called evolution. Charles Darwin (Fig.) was the first to describe evolution in 1859 in his book,$"The \:Origin\: of\: Species".$ According to him, all present day organisms have originated from the same source and during the course of time, have evolved into complex organisms by bringing about variations within their body to adapt to the changing environment. While evolution and classification are related, we will find some groups of organisms which have ancient body designs that have not changed very of organisms much and we will also find other groups that have acquired their particular body designs recently.

Those in the first group possessing ancient body designs are referred to as$' primitive'$ or $'lower'$organisms, while those in the second group possessing recent body designs are called $'advanced'$ or $'higher'$ organisms. Since there is a possibility that complexity in design will increase over evolutionary time, it may that older organisms are simpler, not be wrong say while younger organisms are more complex.