The greenhouse effect and the importance of balancing carbon dioxide in the atmosphere.
The roles of different enzymes in digestion are discussed with an overview of digestion.
Gaseous exchange in the lungs and the important role played by the alveoli is explained.
How farmers manipulate growing conditions to improve quality and yield in crops.
The Exxon Valdez oil spill demonstrates the effects of pollution on the environment.
How pollution and acid rain damages the surrounding environment.
Areas around the world affected by different types of pollution.