Lymphocytes are a type of

a (antigen) b (biological vector)
c (bacterium) d (white blood cell)

Your answer is D, white blood cells
-hope this helps

Ifound this on google “here are some features of the alveoli that allow this: they give the lungs a really big surface area. they have moist, thin walls (just one cell thick) they have a lot of tiny blood vessels called capillaries.for more information go to the website below › bitesize › guidesi hope this you for what your looking for. can you plz mark me brainliest?

Because it's sugar that us the answer