Iwil giva a metal 1. to be useful, a scientific name has to refer to all living species. all living and extinct species. all species in one habitat. a single species. 2. several different classes make up a kingdom. phylum. family. genus. 3. which are the two highest-level taxa in the linnaean system? kingdom and order domain and phylum phylum and kingdom genus and kingdom 4. animals that are warm-blooded, have body hair, and produce milk for their young are grouped in the class amphibia. mammalia. aves. reptilia 5. the only "natural" taxa in linnaeus's system is the phylum. kingdom. genus. species.