A mixture can vary in composition, but a pure substance has a set composition.
Answers should include three of the following ideas:
*The body needs exercise to eliminate wastes properly.
*Food poisoning can be prevented by cooking food properly and by sanitizing areas that come into contact with raw food.
*Some forms of functional dypepsia can be prevented by avoiding overeating, avoiding too many fatty foods, and chewing food adequately.
1. group
2. atomic mass unit
3. period
4. small whole-number
B. the number is limited by how much is lost at each level
