| Bacteria or viruses that cause diseases are called ____. |
allergies |
| Hypersensitivity of the immune system can cause ____. |
antibiotics |
| Your trachea divides into two main ____ that lead to your lungs. |
atria (atriums) |
| The various pigments that give skin and hair color are ____. |
bronchi |
| The ____ are the two upper chambers of the heart. |
kidneys |
| Your two ____ filter blood plasma by separating it from waste. |
melanins |
| Humans have 20 primary and 32 permanent ____. |
pathogens |
| The reproduction of bacteria can be stopped by ____. |
teeth |
