20. a comet's tail always points away from the sun because dust; the solar wind pushes the particles away from the comet's head ion; the solar wind pulls the particles towards the comet's head dust; the solar wind pulls the particles towards the comet's head ion; the solar wind pushes the particles away from the comet's head

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.