Options:
[a]. Chemical energy.
[b]. h2o.
[c]. oxygen.
[d]. antigen fighters.
[e]. harmful substances.
[f]. bioaerosols.
[g]. mucus.
[h]. Organic compounds.
Q: Fact 1: Plasma cells are activated B cells that secrete antibodies. Fact 2: Antibodies are produced to fight antigens. Given the two facts above, what do plasma cells secrete?
A:
[d].