Which body system does saliva come from?

Saliva is a watery substance secreted by the salivary glands which are part of the upper digestive system. The salivary glands are exocrine glands, that is, they secrete substances outside the body or within a body cavity, in this case the oral cavity.

Explanation:

upper digestive system.

answer:

the mother

explanation:

answer:

i don't believe the ocean is purple, but it might once have been:

as for the sky, according to nasa:

"sunlight reaches earth's atmosphere and is scattered in all directions by all the gases and particles in the air. blue light is scattered more than the other colors because it travels as shorter, smaller waves. this is why we see a blue sky most of the time."