Connecting Concepts

Use Science Graphics

John Snow made a map similar to the one below to help him determine the source of the cholera outbreak in London. The dots represent the locations of people who died of cholera. The Xs represent pumps. Use the map to answer questions 31 and 32.

A physical map of London indicating cholera outbreak. The dots indicate the location of people who died because of cholera. The cross marks indicate the pumps.

  1. Infer Which pump do you think Snow determined was most likely the source of the cholera outbreak? Explain.

  2. Apply Concepts Do you think a map such as this one could be used to discover the source of a food poisoning outbreak? Explain.

Write About Science

  1. Explanation The ability of bacteria to resist antibiotics has become an increasing public health problem. This problem is due to the overuse and misuse of antibiotics. Suppose that one of your friends always takes antibiotics when he or she is sick. Write a letter to your friend explaining the problem of antibiotic resistance.

  2. Assess the Explain how the germ theory of disease led people to develop very simple methods that could prevent the transmission of many diseases.


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Table of Contents

Miller & Levine Biology UNIT 1 The Nature of Life UNIT 2 Ecology UNIT 3 Cells UNIT 4 Genetics UNIT 5 Evolution UNIT 6 From Microorganisms to Plants UNIT 7 Animals UNIT 8 The Human Body A Visual Guide to The Diversity of Life Appendices Glossary Index Credits