A because I know it because I have the same test and it was right
The answer is its habitat.
Carl Linnaeus was the father of modern taxonomy. He came up with the idea of a universal system of binomial nomenclature (which is made up of the genus and species, respectively).
Hope that helps!
Biome, though some might say ecosystem instead. Biomes are very large ecosystems that cover broad areas.<span>If they specify "one" reef, then they are probably looking for "ecosystem"</span>
