1. “Do Now” Take out a sheet of paper and answer the following questions: 1. 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.

2. 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

3. 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

4. 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

5. What species are affected by this destruction of habitat?

6. 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

7. 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

8. Biodiversity – True or False?

9. Answers 9. true 10. false 11. false 12. true 13. false 14. true 15. true

10. Group Assignment Read Chapter 5 in the textbook 1. Page 129: Write definitions for the vocab terms 2. Page 130: “Understanding Key Concepts”(#6-9) 3. Pages 136-137: “Multiple Choice” (#1-9) **Write out all questions and answers. No credit will be given for simply writing the answers.