Answer:
Isolate
Explanation:
Joe Feagin, a U.S sociologist and social theorist defined discrimination as differential treatment or behaviour toward someone or group (usually in the minority or subordinate) with a negative impact on such individual or group. Isolate discrimination is an intentional form discrimination by a dominant group targetted at a particular minority group based on race or ethnic backgrounds
Nitrite poisoning commonly called "brown blood" disease is an environmental condition that affects a number of fish species cultured for food today including channel catfish. Its cause is elevated levels of nitrite in the pond or culture system water.
B. Is manipulated by the researcher
