If there is no variation or it is only acquired, then evolution can not occur. Evolution is described as the gradual change of a species caused by variation in genetics into a new species. Therefore, without variation there is no change to the species, and without change there is no evolution. Al...

Every organism at one time or another has to learn to adapt to a new environment. This is why evolution of organism is needed in order to survive changes to its environment, such as the case of the flightless birds. For one reason or another over a period of 100,000 years the need for wings was unne...

Every organism at one time or another has to learn to adapt to a new environment. This is why evolution of organism is needed in order to survive changes to its environment, such as the case of the flightless birds. For one reason or another over a period of 100,000 years the need for wings was un...