The answer is c
Because homeostasis is the state of steady internal, physical, and chemical conditions
Rhinoviruses are transmitted through the air or via contact. We might expect this sort of transmission to require a fairly healthy host (one who gets out and comes into contact with others) and, hence, to select against virulent strains. If we take precautions and try to stay away from people or avoid any contact with people, more hand-washing stations, increased attention to sanitization, and isolation of patients will help to reduce the transmission of the disease and, in the process, may favor the evolution of less virulent strains of the virus.
Answer: A = nucleus, B = plastids , C = ribosomes , D = cytoplasm
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I believe the answer you're looking for is fertilization. :D