Answer:
Sty I have not learned this yet hopefully i will next year
Answer:
(B) They Bind to receptor proteins on the surface of the postsynaptic neuron.
I Hope this helps!
Answer: Domain.
Explanation: I'm glad that you asked this question. When it comes to to biology and the identification of species, domain is the highest rank that you can find in taxonomy. If you look at the taxonomy ranks, this is the order: Domain > Kingdom > Phylum > Class > Order > Family > Genus > Species.
That is why domain includes all of the rest, because in the pyramid, it is the one at the top.