A single human B cell can produce only D. 1 antibody.
It produces a single species of antibody, with unique antigen-binding site.
Answer:
You could line up 109 Earths across the face of the sun.
water picks up pollutants when condensating then falls back to earth
The germinal period ends approximately two weeks after conception. <span> This </span>stage<span> occurs during the first 2 weeks of development (or the 2nd - 4th weeks of pregnancy). The union of the sperm and egg cell forms a single cell called a zygote. </span>