- What aspect of William Harvey's view of blood circulation could be considered a scientific hypothesis? What would you predict from that hypothesis? What observation could you carry out today to test this hypothesis?
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- Which of the characteristics of living things are possessed by an automobile? What bearing does this have on our definition of life?
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- About 1 out of every 120 live-born infants has a structural defect in the heart such as a hole between two heart chambers. Such infants often suffer pulmonary congestion and heart failure, and about one third of them die as a result. Which of the major themes in this chapter does this illustrate? Explain your answer.
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- Why is a monkey not classified as human? Why is a horse not classified as a primate? (Hint: What characteristics must an animal have to be a human or a primate, and which of these are monkeys or horses lacking?)
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- Suppose you have been doing heavy yard work on a hot day, and sweating profusely. You become very thirsty, so you drink a tall glass of lemonade. Explain how your thirst relates to the concept of homeostasis. Which type of feedback-positive or negative-does this illustrate?
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