30. which of the following best describes what causes the seasons? (2 points)
the earth is closer to the sun in the summer and farther away in the winter.
the earth's tilt on its axis.
the sun is hotter in the summer than it is in the winter.
cold air from space cools the earth during winter.

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.