When Charles Darwin considered some of the unique structures found in modern animals, like the feathered wings of birds, he famo
usly proposed that modern animals must have evolved from earlier forms that lacked those structures. He also predictedA.that it would be impossible to find fossil evidence for this idea because the fossil record is so incomplete. B.that genetic evidence would show that all organisms share a common ancestor. C.that fossils would be found with structures that are intermediate between early and modern forms. D.that fossil evidence would instead show that all modern animals have always existed in their present form.
Because of the fact that female mammals have chromosomes from both parents (from the father and from the mother) and all cells have the same inactivated X chromosome female mammals are considered to be mosaic <span>of the maternal and paternal cells.</span>
