Columbus and other Europeans of his time believed that the Earth was
roughly 50 percent smaller than it really is.
roughly 50 percent larger than it really is.
about the same size as it really is.
just slightly smaller than it really is.

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.

True but only in the south coastal areas during september and early october.