Chapter 20 & 21

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Across
  1. 5. an organism in which a pathogen lives all or part of its life
  2. 6. Study of choices people make as they use and distribute limited resources
  3. 10. curve Shows the relative effects of various doses of a drug or chemical on an organism or organisms as determined by experiments
  4. 11. An organized attempt to attempt to influence the decisions of lawmakers.
  5. 12. Impact Statement States the needs for a project, its impact on the environment, and how negative impacts can be minimized
  6. 13. The amount of a harmful chemical to which a person is exposed to
Down
  1. 1. Conditions in which human needs are met in such a way that a human population can survive indefinitely.
  2. 2. Particles in the air that are small enough to breathe into the lungs
  3. 3. organisms (such as mosquitos) that transmit diseases to people
  4. 4. Organisms that cause disease
  5. 7. Study of the spread of diseases
  6. 8. the study of harmful effects of substances on organisms
  7. 9. assessment an assessment of the risk posed by an action or substance