1. The female ovaries and the male testes are a part of which body system? Can these organs be members of more than one organ system? Why or why not?
  2. Identify three different ways that growth can occur in the human body.
  3. Oxygen, whose atomic number is eight has three stable isotopes: 16O , 17O, and 18 O. Explain what this means in terms of the number of protons and neutrons.
  4. Explain why CH4 is one of the most common molecules found in nature. Are the bonds between the atoms ionic or covalent?

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