Science

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Across
  1. 1. Short form used to measure air quality.
  2. 2. The body’s ability to fight diseases.
  3. 4. An organism that lives on or inside another organism and gets nourishment from it.
  4. 7. The first widely used antibiotic discovered by Alexander Fleming.
  5. 9. Materials that are generally shiny and good conductors of heat and electricity.
  6. 10. A condition causing frequent loose stools.
Down
  1. 1. Medicines used to kill or stop the growth of bacteria.
  2. 3. The gas essential for breathing.
  3. 5. A pure substance made of only one kind of atom.
  4. 6. A combination of substances that are not chemically joined.
  5. 7. A disease-causing microorganism.
  6. 8. A substance formed when two or more elements chemically combine.