This is the process by which organisms acquire traits through sexual reproduction and/or mutation and then pass on these traits to the succeeding generations.

Biological evolution is the process by which organisms acquire traits through sexual reproduction and /or mutation and then pass on these traits to the succeeding generations. In biological evolution, changes always occur at the genetic level of a population and it is transfer from one generation to the next ; this is called micro-evolution. The idea that all life is connected and can be traced to one ancestor is called macro-evolution.