Answer :
saliva is created in the salivary glands which are part of the digestive system therefore saliva comes from the digestive system
Answer:
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.