The definition. Biological evolution, simply put, is descent with modification. This definition encompasses small-scale evolution (changes in gene frequency in a population from one generation to the next) and large-scale evolution (the descent of different species from a common ancestor over many generations). Evolution helps us to understand the history of life. The explanation Biological evolution is not simply a matter of change over time. Lots of things change over time: trees lose their leaves, mountain ranges rise and erode, but they aren't examples of biological evolution because they don't involve descent through genetic inheritance.
Southpaw is a boxing term that designates the stance where the boxer has his right hand and right foot forward, leading with right jabs, and following with a left cross right hook. Southpaw is the normal stance for a left-handed boxer.
The Boxer is a short-haired, medium-sized breed with a square, short muzzle. Originating from Germany in the 1800s, the breed is related to the Bulldog, and was originally bred as hunting companions. The Boxer's strength and agility made it perfect for running down and holding on to large prey until the hunter could reach it. The Boxer is classified with the working group of dogs. It has, in both past and present, worked with the military as a pack carrier and messenger, with police K9 units, as guides for the blind, and as both attack and guard dogs.