They will understand that knowledge generated by one generation usually is expanded, modified, or even discarded by the next generation. Theories just become stronger as more supporting evidence is gathered. They provide a context for further research and give us a basis for prediction. For example, the theory of biological evolution is an explanation for phenomena such as diversity of species. Gene theory is an explanation for relationships we observe between one generation and the next.
Laws are fundamentally different from theories.
They are universal generalizations based on observations of the natural world, such as the nature of gravity, the relationship of forces and motion and the nature of planetary movement. Scientists, in their quest for the best explanations of natural phenomena, employ rigorous methods. Scientific explanations must adhere to the rules of evidence, make predictions, be logical, and be consistent with observations and conclusions. Explanations of how the natural world changes based on myths, personal beliefs, religious values, mystical inspiration, superstition, or authority may be personally useful and socially relevant, but they are not scientific. Science as Inquiry - Inquiry should be the central theme in biology.