Complete the sentence about Saiga tatarica with the correct year: A ______ study revealed that a steep decline has occurred in the genetic variability of the saiga since the late Pleistocene-Holocene, probably due to a population bottleneck.
Answer and explanation
Correct answer: D. 2010
A 2010 study showed that the saiga's genetic variability has dropped sharply from the late Pleistocene onwards.
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