1. The nose and throat of a dog
The most important function of the respiratory system is to deliver oxygen into the blood, which distributes it throughout the body, and to remove carbon dioxide from the blood. The exchange of oxygen and carbon dioxide occurs in the alveoli.
3. A waste digester, such as the Doggie Dooley is about the size of a bucket, which you bury in your yard. You open the lid, put the dog poop in, add an enzyme and water once a week. The waste liquefies and returns to the earth.
