instruction:
In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
question:
One species , the northern fur seal ( " Callorhinus ursinus " ) inhabits the North Pacific , while eight species in the " Arctocephalus " genus are found primarily in the Southern hemisphere .
answer:
Eight species belong to the genus " Arctocephalus " and are found primarily in the Southern Hemisphere , while a ninth species also sometimes called fur seal , the northern fur seal ( " Callorhinus ursinus " ) , belongs to a different genus and inhabits the North Pacific .


question:
In the " Prose Edda " book " Gylfaginning " , Elli defeats Thor in a wrestling match .
answer:
In Norse mythology ( a subset of Germanic mythology ) , Elli ( Old Norse " old age " ) is a personification of old age who , in the " Prose Edda " book " Gylfaginning " , defeats Thor in a wrestling match .


question:
An artesian aquifer is trapped between rocks or clay which causes the pressure .
answer:

An artesian aquifer is trapped water , surrounded by layers of impermeable rock or clay which apply positive pressure to the water contained within the aquifer .