Human activities can alter an ecosystem and bring about the extinction of a species. such activities include any of these except

Human activities can alter an ecosystem and bring about the extinction of a species. Such activities include any of these except assuring a habitat remains unaltered. 

Cramming you staying up all night to get a lot of work done for a class and is very stressful

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.