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By Allan B. Cobb

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Fossil record a collection of all known fossils The next candidate for selection in the fossil record is Hyracotherium, an animal that lived about 55 million years ago. Hyracotherium was more horselike than Eohippus, with its skeleton showing the characteristics that became unique to horses. The skull was longer and larger, and had a shallow basin at the end of shortened nasal bones where the nose is. The lower jaw was bigger and stronger than its relatives. The top and bottom incisors, or front teeth, met squarely and formed a “nipping-type” set of teeth.

Mountain Lion Alert: Safety Tips for Yourself, Your Children, Your Pets, and Your Livestock in Lion Country. Helena, MT: Falcon Press, 1997. Human Commensal and Mutual Organisms From the moment of birth and throughout our entire lives, humans share their bodies with a surprising variety of microscopic organisms. Dust mites remove dead skin, amoeba live on their teeth and scavenge food particles, and eyebrow mites live on their eyebrows. 5 ϫ 1013 cells. Many of these cells are not of human origin, but represent microscopic commensal and mutual organisms.

Whales, bats, and humans have many more traits in common than are shared by bats, birds, and insects despite the fact that the latter three have wings. Therefore, mammals are considered to be a natural group and the forelimbs of mammals are considered homologous, whereas the wings of birds, bats, and insects (an unnatural group whose members do not 15 Hormones share a common, winged ancestor) are considered homoplastic. It is the pattern of relationships among taxa with the trait in question that determines the nature of the similarity.

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