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“Do Now” Take out a sheet of paper and answer the following questions: What are some reasons that a population’s growth is limited? 2. What is the disadvantage of a rapid growth in human population? 3. Explain the relationship and trend between predator and prey population in an ecosystem. 1. Biodiversity Definition: number and variety of species on Earth 1.6 million known species on Earth Most are insects Scientists believe there are >13 million species now living Humans & Biodiversity Population of world is increasing at rate of 220,000 people each day Because increase in human population, species become extinct at faster rate Humans & Biodiversity Why does the increase in human population have such a large effect on other species? Humans struggle with other species for resources Main causes of species extinction: 1. Destruction of habitats (75% of extinctions) 2. Unregulated hunting 3. Introduction of nonnative (exotic) species What species are affected by this destruction of habitat? Exotic Species Definition: species not native to a particular region Ex: penguins would be an exotic species in farmlands Exotic species can threaten native species Native species develop specific defenses to survive in their environment Example: Melaleuca tree in Florida Value of Biodiversity Why is it important to slow down the rate of extinction? 1. Preserves Ecosystems Keystone species= species that are extremely important to the function of ecosystem i.e. sea otter 2. Practical Uses of Species Medicine, treatments, food, etc. i.e. Taxol from Pacific Yew Tree treats some cancers 3. Ethical & Aesthetic Reasons Biodiversity – True or False? Answers 9. true 10. false 11. false 12. true 13. false 14. true 15. true Group Assignment Read Chapter 5 in the textbook Page 129: Write definitions for the vocab terms 2. Page 130: “Understanding Key Concepts”(#6-9) 3. Pages 136-137: “Multiple Choice” (#1-9) 1. **Write out all questions and answers. No credit will be given for simply writing the answers.