Please give me site where you found info, and please explain in detail rather than being vague.
They are fused due to natural selectionWhen bones are fused, they become stiffer because of their larger diameter, which makes them less likely to bend when force is applied to themCannondale bicycles use the same physical principleThe early models used aluminum to save weight, but since aluminum is a softer metal than steel, they are more likely to bend under stressTo keep them from bending, the aluminum tubes were made larger in diameter than steel tubes to give them extra stiffnessSince frogs evolved jumping, their legs are subject to greater force than animals that walkNatural selection therefore favors frogs that have mutations that resulted in bones being fusedFrogs with fused leg bones are less likely to suffer fracturesBirds also have many fused bones, since their wing bones need to be stiff to allow them to flap their wings to generate a lot of force without breaking.
Fruit, vegetables and grains, all are high in fiber.
