1. You have been selected to fill the position of naturalist aboard the first voyage to another planet. You are responsible for describing life forms found on this planet. Write a paragraph explaining how you would determine whether something was alive.

2. A number of scientists are responsible for the development of the cell theory. These include Theodor Schwann, Matthias Schleiden, Rudolph Virchow, Louis Pasteur, Robert Brown, and Alexander Braun. Choose one of these scientists and research his contribution to the cell theory. Report your findings to the class orally or in the form of a poster or pamphlet.

3. Explain the difference between the terms non-living and dead.

4. Describe in a sentence what happens to individual cells when an organism grows, reproduces, or repairs damage.