A great example of a physical boundary is a mountain. For example, the Pyrenees Mountains, which serve to separate France and Spain, are a physical boundary. So are the Ural Mountains which separate Europe and Asia. Along with mountains, oceans, seas, even deserts are examples of physical boundaries.
An average size apple weighs 6.4 ounces, which is equal to 180  grams. One apple contains approximately 91 calories and 3 grams of  dietary fiber.
The natural sugars fructose and sucrose account for approximately 75 percent of the carbohydrates in apples. A large apple contains approximately 23 grams of sugar; a medium apple contains 19 grams. Although apples contain a significant amount of natural sugar, they are a low glycemic index food.