Answer:
Humoral immunity refers to the component of the adaptive immune response that is caused by B cells, antibodies, and type 2 helper T cells (Th2), as well as circulating mast cells and eosinophils to a lesser extent.
I would say that the answer would be D) it obtains nutrients from its environment. Hope i could help!
[creds: thoughtco]
A nucleotide consists of three parts: a phosphate group, a 5-carbon sugar, and a nitrogenous base.