3 who was thomas malthus and what was the major

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3. Who was Thomas Malthus and what was the major thesis of his Essay on the Principle of Population? 4. What four factors determine the size of a population? Which one(s) result in population increases? Which one(s) limit population size?
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Review Questions 521 5. What is a population’s growth rate? (Write this answer in words and in a mathematical equation.) 6. How is immigration different from emigration? 7. What is the difference between a population’s absolute number and its density? 8. Describe the range, habitat, and niche of an organism of your choosing. Now do the same for humans. 9. Describe biotic potential and environmental resistance. Give examples of each. 10. How are extrinsic factors different from intrinsic factors? Give examples of each. 11. What is the meaning of “exponential growth” in a population? Why doesn’t this type of growth occur for long in nature? 12. What is the meaning of “logistic growth” in a population? 13. What are “density-dependent limiting factors”? Give some examples. 14. What are “density-independent limiting factors”? Give some examples. 15. What is meant by the carrying capacity of a population? 16. How do K -selected species differ from r -selected species? Give some examples of each.Are humans K -selected or r -selected? 17. What is the difference between physiological longevity and ecological longevity? 18. Give some examples of organisms that interact as predator and prey; as competitors; as parasite and host; as commensals; as mutualists. 19. Briefly describe the competitive exclusion principle. 20. What are two probable outcomes of competition between closely related organisms? 21. What are two general types of predator–prey relationships? Give examples of each. 22. Give examples of Müllerian and Batesian mimicry.
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