All living organism are composed with cells.

New cells come by cell division .

Cell can - grow, divide ,produce proteins ,multiply .

Cells also store data of the organism in a molecule .

It is called DNA, in 1/2 gram of DNA the whole youtube can be stored .

DNA control how a organism looks and function .

When the cell divide in to two the DNA will be copped to the new cell .

But some time a change will come and that cause mutation .

Mutation will change the characteristic of an organism .

This mutation will be favorable or unfavorable for the organism.

This is called natural selection .

This the key mechanism of evolution

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