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.

1. Several different classes make up a
   
   

kingdom.



phylum.



family.



genus.

1. Which are the two highest-level taxa in the Linnaean system?
   
   

kingdom and order



domain and phylum



phylum and kingdom



genus and kingdom

1. Animals that are warm-blooded, have body hair, and produce milk for their young are grouped in the class
   

Amphibia.



Mammalia.



Aves.



Reptilia

1. The only "natural" taxa in Linnaeus's system is the
   

phylum.

kingdom.

genus.

species.