What is a ‘control’ in an experiment?
A. A person who oversees the experiment to make sure it is following proper procedures.
B. The variable controlled by the scientist to affect the dependent variable.
C. The name for the set of independent and dependent variables that will be controlled by the scientist.
D. A version of the experiment that is unchanged to make sure the experimental data is not due to chance.

Nitrate poisoning for the first onebaby blue syndrome

Cotton was the very first

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.