Birds first appeared and rose to prominence during the: answer precambrian paleozoic era mesozoic era cenozoic era

Birds developed in the Mesozoic era, but diversified greatly in the Cenozoic. The answer is c), Mesozoic era.

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.