The attached diagram shows changes in the foot bones of four ancestors of modern horses over the past 50 million years. Eohippus lived in swampy areas with soft mud. Since this time the ground in the habitat has become drier and harder. All of the horse ancestors were preyed upon by other animals. The changes in the arrangement of the foot bones of horses support Darwin’s theory of evolution by natural selection. Explain how the arrangement of the foot bones of Eohippus could have evolved into the arrangement of the foot bones of Equus.​