query: How many species of kelp are there?
passage: Kelp
Kelps are large brown algae seaweeds that make up the order Laminariales. There are about 30 different genera.[3]
passage: Elk
Recent DNA studies suggest that there are no more than three or four subspecies of elk. All American forms, aside from possibly the Tule and Roosevelt elk, seem to belong to one subspecies ("Cervus canadensis canadensis"). Even the Siberian elk ("Cervus canadensis sibiricus") are more or less identical to the American forms and therefore may belong to this subspecies, too. However the Manchurian wapiti ("Cervus canadensis xanthopygus") is clearly distinct from the Siberian forms, but not distinguishable from the Alashan wapiti. The Chinese forms MacNeill's deer, Kansu red deer, and Tibetan red deer belong also to the wapitis and were not distinguishable from each other by mitochondrial DNA studies. These Chinese subspecies are sometimes treated as a distinct species, namely the Central Asian red deer ("Cervus wallichi"), which also includes the Kashmir stag.