... Many Di erent Types of Mammals Meteorites and the Age of the Solar System Colors, Brightness, and the Age of Stars Distances, Redshifts, and the Age of the Universe ... character- istics of life on earth changed in a variety of ways. For example, around the end of the age of dinosaurs, a group of shrew-like animals became the diverse array of creatures we now ... hundreds of stones and buildings inscribed with various combinations of human body parts, bits of animals, pieces of plants, and a host of more abstract symbols (see Figure .). For hundreds of years,...