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Organism of the Day: Sloth Sloth (Animal) Sloths are extremely slowmoving mammals found in the rainforest canopies of Central and South America. There are two species of sloths:two toed and threetoed. Most sloths are about the size of a small dog and they have short, flat heads. The spend most of their time upside down and sleep for hours this way. They eat mainly leaves and their digestive process can take a month or more to complete. Their stomach is what constitutes most of their weight and is composed of multiple compartments to digest the roughage. Question: Do you think these organisms are more closely related to bears or to snakes? Explain your reasoning. 1 ` Biology Monday, May 14, 2012 1. Organism of the Day: Sloth 2. Review Homework 3. Notes 4. Start Homework Announcements Due Today: Notebook Check and Study Guide Due Tuesday/Wednesday: Read 16.3 and answer questions 1 2 and read 16.4 and answer questions 1 5. Evolution Review: Sunday May 13th or Tuesday May 15th in room 326 2 Review Homework 3 Evolution Notes 4 Evolution Notes 5 Evolution Notes Evolution: Darwin's Observations: R 1. Species vary globally: O 2. Species vary locally: 3. Species vary over time: Fossils: Preserved the remains of ancient extinct organisms. 6 Evolution Notes Influences on Darwin James Hutton and Charles Lyell: Uniformitarianism Artificial Selection: 7 Evolution Notes Influences on Darwin Jean Baptiste Lamarck: Acquired characteristics 8 Evolution Notes Influences on Darwin Thomas Malthus: 9 Evolution Notes Evolution by Natural Selection 1. Struggle for Existence 2. Variation and Adaptation Adaptation 3. Survival of the Fittest Fitness 4. Natural Selection 10 Evolution Notes Evolution by Natural Selection Example 11 Start Homework 12 Exit Question What is natural selection? Reminders Due Tuesday/Wednesday: Read 16.3 and answer questions 1 2 and read 16.4 and answer questions 1 5. 13