Which do the green tanks represent in the picture below?
a. vaccines b. pathogens c. antibodies d. antigens

The right answer is C.

An antibody is a complex glycoprotein used by the immune system to specifically detect and neutralize pathogens. The antibodies are secreted by cells derived from B lymphocytes: the plasma cells.

So if we want to shematize the immune reaction, the tanks represent the plasma cells and the canons represent the antibodies.

On edge.nuity the answer is C- Antibodies

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.