Adenine, Guanine, Cytosine and Uracil are nitrogenous bases that belong to DNA
RNA
none of the above

Providing immunity by injecting the body with a weakened form a pathogen is known as

Creation of an unnaturally uniform sample to represent a diverse populationcan be avoided by: a. including only willing b. asking another scientist for .c. choosing only identical participants.d. selecting individuals at random.

How do diseases caused by bacteria and diseases caused by viruses react to antibiotics?