Curare is a substance that, when ingested, blocks a receptor for acetylcholine in muscles, causing paralysis. Curare is thus an example of an substance that is an for acetylcholine.

linnaeus is the father of taxonomy, which is the system of classifying and naming organisms. one of his contributions was the development of a hierarchical system of classification of nature. today, this system includes eight taxa: domain, kingdom, phylum, class, order, family, genus, and species.