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.
Boxers also have an inherited risk of arrhythmogenic right ventricular cardiomyopathy (ARVC). ARVC, as the name implies, is also a disease of the heart muscle. Boxers and Bulldogs with ARVC develop fatty or fibrous tissue which replaces normal heart cells. This abnormal infiltration results in problems with the heartâs electrical conduction system and arrhythmias (irregular heart beats) occur.