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Unformatted text preview: fish from the most primitive to more advanced types of fish. Primitive fish do not have jaws or pectoral fins, more advanced fish such as sharks have cartilage skeletons. 6. Describe the three types of mammals based on how their young develop. The three types of mammals are; marsupials, which have their young develop in a pouch, monotremes which lay eggs and the young develop in the egg, and placentals which have their young develop in a womb. References AIU Online. (2011). SCIE206-1055B-11: Biology: Unit 5 Multimedia Course Material. Audesirk, G., Audesirk, T., & Byers, B. (2005). Biology: Life on earth with Physiology 9th Ed. San Francisco, CA: Pearson Education....
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