Characteristics+of+Life

Class questions and answers:
What is in the flasks? What is in the attached test tubes? Why did the bromothymol blue turn yellow when exhaled into?

Homework:
1. How does yeast make dough rise? 2. A recipe instructs you to add yeast to warm water not hot. Why? 3. Why does a recipe instruct the cook to let the yeast and water stand for 5 minutes or until bubbly? 4. What does the production of carbon dioxide gas indicate about yeast? 5. How can you be sure that the carbon dioxide gas was produced by the yeast? 6. Summarize what you have observed about yeast to classify them as living organisms.

How organisms meet the characteristics of life:

Trees: http://www.usatoday.com/weather/environment/2007-10-08-fall-colors_N.htm?csp=34weather