Define evolution. How does it occur ? Explain how fossils provide evidences in support of evolution.

Monjur Alahi

Define evolution. How does it occur ? Explain how fossils provide evidences in support of evolution.


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Salim Ahmed Kawsar

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Evolution: Gradual accumulation of variations and its selection by nature leading to formation of new species. Variations may arise in a population due to mutations or sexual reproduction. Sub-populations are formed due to genetic drift and geographical isolation. When natural selection acts on them, most suitable variation survives leading to evolution of a new species.  Fossils provide missing link between the species who has evolved from whom. They provide information about prehistoric organisms.

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