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