Which of the following is an example of a population?
a.
all of the trees in yellowstone national park
b.
all leopard frogs in the world
c.
all of the western diamondback rattlesnakes in big bend national park
d.
all plants and animals in grand canyon national park

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.