Answer:
The correct answer is D. proliferation and differentiation.
Explanation:
Primary immune response occurs due to the first exposure of an antigen to the immune system. The primary immune response is generally delayed by many days because it takes time for B and T cells to become cloned and to proliferate and differentiate.
Then after several days of proliferation and differentiation of activated T and B cells, T cells become effector T cells and B cell becomes plasma cells which then eliminates the antigen. Memory B and T cells are also produced during this process which helps in generating a quick immune response during the second and subsequent exposure of that antigen.
So the correct answer is D. proliferation and differentiation.
Disaccharide is formed when glucose and fructose are combined
Pesticides<span> can travel great distances through the </span>environment. When sprayed on crops or in gardens,pesticides<span> can be blown by the wind to other areas. They can also flow with rain water into nearby streams or can seep through the soil into ground water. ... Selective </span>pesticides<span> are toxic only to the target pests.</span>
