1 As you get older, your risk of a rotator cuff injury increases. Rotator cuff tears are most common in people older than 40.  Certain sports. Athletes who regularly use repetitive arm motions, such as baseball pitchers, archers and tennis players, have a greater risk of having a rotator cuff injury.
Evolution by natural selection is one of the best substantiated theories in the history of science, supported by evidence from a wide variety of scientific disciplines, including paleontology, geology, genetics and developmental biology.
The incorporation of genetics and Darwin's theory is known as modern evolutionary synthesis.. The physical and behavioral changes that make natural selection possible happen at the level of DNA and genes.