1. At the beginning of the spring, Dr. Peter Erlenmeyer notices that there is an equal distribution of long and short stemmed dandelions in the vacant lot across the street from his house as well as in his own backward. By the end of the summer he notes that there are mostly long stemmed dandelions in the lot, but mostly short stemmed dandelions in his yard. These observations are examples of what biological principle? Develop a hypothesis to explain Dr. Erlenmeyer's observations.

2. You have discovered a new substance that you suspect may be a living organism. What characteristics would this substance need to have in order to be classified as living?

3. Explain how the information stored in DNA is the key to the expression of traits.