2.  List the 8 characteristics of life that we learned  A scientist examines how algae respond to different wavelength of light by placing them in a container that has separate sections of different colored light. After a day he realizes that the blue and red light sections have the highest algal cell per cm ³ concentration. Name the variables with the proper units.

3.  List the levels of organization in order of increasing size  All living things that belong to the same species and live together form a ___________________.  The basic unit of life is _________________  A scientist discovers that even cork that comes from a tree, has small spongy looking holes in it. These holes can be a reference to what structures? What characteristic of life does this discovery fulfill?

4.  Differentiate between autotroph and heterotroph organisms.  List three important characteristics of a good graph.  Define community.  Homeostasis is ________________  List the steps of the scientific method  Define asexual reproduction.  Water allows living things to regulate their body temperature. What chemical and physical properties are responsible for this?

5.  Differentiate between cohesion and adhesion. What chemical property of water is responsible for this? Name one reason why it is important for life.  What causes the color of water? Why is it important for life?  Name the four most important elements for life, their number of valence electrons and the number of their bonds.  List four important properties of carbon.  Define what an organic molecule is and name 2 exceptions.

6.  Define what an acid is. Describe two of its characteristics  Define what a base is. Describe two of its characteristics.  What substance is responsible for keeping the pH constant?  What substance is able to show the presence of an acid? How does it show the presence of an acid?