Explanation:

Pepsin is an endopeptidase that breaks down proteins into smaller peptides. ... It is produced in the chief cells of the stomach lining and is one of the main digestive enzymes in the digestive systems of humans and many other animals, where it helps digest the proteins in food.

saliva = Saliva (commonly referred to as spit) is an extracellular fluid produced and secreted by salivary glands in the mouth. In humans, saliva is 99.5⁠% water plus electrolytes, mucus, white blood cells, epithelial cells (from which DNA can be extracted), enzymes (such as amylase and lipase), antimicrobial agents such as secretory IgA, and lysozymes.

Answer:

saliva : Saliva is water fluid secreted through salivary gland. It consists of water (98%) and enzymes , mucus

enzyme: enzyme are molecules (mostly protein) with change the rate of reaction.

pepsin : it is endopeptidase , secreted by Cheif cell of stomach , which degrades Protein into smaller peptides