Question

What is Evolution ? Explain

Answer 1

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

synonyms:Darwinism, natural selection

"early ecologists were not interested in evolution"

2.

the gradual development of something.

"the forms of written languages undergo constant evolution"

synonyms:development, advancement, growth, rise, progress, progression, expansion, extension, unfolding; 

Answer 2

A gradual genetic change in a group of living being to produce new forms is termed as evolution.
Evolution cannot be said to 'progress ' from 'lower ' forms. Rather, evolution seems to have given rise to more complex body designs even while the simpler body designs continue to flourish.
The reasons for evolution are:
1.Natural Selection :A group of living beings adopts to fit their environment better.
2.Genetic Drift : Provides diversity without any adaptations. There is a random change in gene frequency.

Hope it is helpful.