Saliva is ....?

Question

1] is produced only when there is food in the mouth
2] is responsible for peristalsis in the mouth
3] moistens food and begins starch digestion in the mouth
4] does not prevent bacterial infection in the mouth

Answer 1

3.

Is this a test question?
More info:
http://en.wikipedia.org/wiki/Saliva

Answer 2

3

Answer 3

3)

Answer 4

3)