| 1 | And ink from soot and spit. | |
| 2 | A dog salivates when it sees a bone. | |
| 3 | Saliva is secreted by glands in the mouth. | |
| 4 | Digestion begins in the mouth with the action of saliva. | |
| 5 | He wondered whether any of the bacteria in spit would work instead. |
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