The correct answer is B cells.
<span>Humoral immunity is a type of immunity which is
mediated by antibodies (immunoglobulins IgA, IgB, and IgM) in extracellular
fluids secreted by B cells. B cells recognize antigens or pathogens that are
circulating in the lymph or blood and have a role to neutralize it or eliminate
it.</span>
A.
Commuters drive personal vehicles to their places of work: offices, manufacturing plants etc.
Some may use car pooling or mass transit like buses. But too many want the luxury and convenience of coming and going on their own terms.
IMHO car pooling and mass transit needs to be used more to reduce environmental harm.
It only has 3 functions: <span>ransport of nutrients, oxygen, and hormones to cells throughout the body and removal of metabolic wastes (carbon dioxide, nitrogenous wastes).</span>
I would go with the letter
B- when the frequency of dominant alleles is equal to the frequency of recessive alleles.
Hope that this helps!!! :)
Science
This is true because humans can only know so much due to unexplored lands, water depth, and evidence of extinction being hidden.
