Well, turtles grow at different rates, just like humans do. Some feed more than others, some exercise more, some are just genetically born to be big or small. This genetic variability ensures that no two turtles are alike, and keeps the population healthy and diverse through evolution.
For instance, if all turtles were genetically identical and a fatal disease was to affect the population, they would all die. However, if some of them had different genetic composition they might resist the disease and survive.












