What is the main function of structural adaptations? a. they the organism survive in its environment. b. they the organism find a mate in other environments. c. they serve no useful purpose. d. they provide a home for the organism.

The question is asking "What is the main function of structural adaptations?" and the best answer is that A. They help the organism survive in its environment. Basically this is what drives the evolution the most - traces that help the organism survive in its environment are being promoted, and the offspring with those traces has the best chance for survival.

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.