In a plant, what is formed by a group of xylem vessels? A. a cell
B. a tissue
C. an organ
D. an organ system

Yes he thought they should be left to chance why, because he thought that was the best thing to do

The answer is c. they had seedshope this

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.