At one time, people believed that life spontaneously arose regularly from non-living things. For
example, many people believed that spoiled meat produced living maggots. Why was spontaneous
generation considered to be an adequate explanation back then, but is no longer accepted as a valid
theory today?

the glands which are associated with each description is given below:

pancreas - is an endocrine and exocrine gland that secretes juices with enzymes for digestion. salivary glands- with protection and digestion in the mouth. liver- secretes bile for digestion.   lachrymal glands - secrete tears to moisten eyes and protect them from particles and infection.   sweat gland -regulates water, salt, and temperature. oil glands - to form a protective barrier on the skin.   goblet cells - secrete mucus for protection.