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Partial List of Candidate Species for De-extinctionCommon name Scientific name Became extinct Huia Heteralocha acutirostris 1907 Caribbean monk seal Monachus tropicalis 1952 Passenger pigeon Ectopistes migratorius 1914 Saber-toothed cat Smilodon 11,000 years before present Woolly mammoth Mammuthus primigenius 6,400 years before present
The passage of time is among the many obstacles faced by scientists who are pursuing de-extinction efforts—that is, efforts to use breeding or a mixture of cloning and genetic engineering to bring back extinct species. Specifically, researchers are concerned that the longer a species has been extinct, the less likely it is that a suitable habitat still exists for that species. Among candidate species for de-extinction, this problem would be especially concerning for the ______blank
Which choice most effectively uses data from the table to complete the statement?