5. Mechanical
6. chemical
7. amino acids
8. enzymes
9. c. chewing makes food smaller
10. c. molars
11. a. premolars
12. b. incisors and canines
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Artificial selection can create organisms that are desirable to humans but dangerous to the population (other species). It can also create new mutations, perpetuate harmful mutations, or breed the new generation having a shorter life span.