To predict: How a 300 million years old fossil having jaw hinge and teeth like mammals would help our understanding about the origin of mammals and the evolution of skeletal structures. Concept introduction: Mammals are the large class of vertebrate animals that have evolved along with the amphibians and reptiles. They belong to the group of animals called tetrapod (four-limbed vertebrates). Mammals have a unique anatomical features that allowed the scientists to trace their evolutionary origins. The fossil records show that the unique skeletal features of mammalian such as hinged jaws and teeth have evolved progressively over time.

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Chapter 25.2, Problem 3CC

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To predict: How a 300 million years old fossil having jaw hinge and teeth like mammals would help our understanding about the origin of mammals and the evolution of skeletal structures.

Concept introduction: Mammals are the large class of vertebrate animals that have evolved along with the amphibians and reptiles. They belong to the group of animals called tetrapod (four-limbed vertebrates). Mammals have a unique anatomical features that allowed the scientists to trace their evolutionary origins. The fossil records show that the unique skeletal features of mammalian such as hinged jaws and teeth have evolved progressively over time.

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