The four main climate zones—tropical, subtropical, temperate, and polar—are designated because their greatly affects their temperature.
a. proximity to water
b. latitude
c. density
d. proximity to mountain ranges

B.latitude i belive this is the awnser 
but i could be wrong sorry in advanced if i am

If the experiment was perfomed more then once and you get the same results

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.