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【单选题】
美国生物多样性研究中心的专家做出结论，地球上每小时消失约3种植物群或动物群，并且某些生物种类经常在科学家还没有发现之前即已灭绝。由此推算，到2050年，世界上将有90%以上的动植物群灭绝。 以下哪项如果为真，最能反驳以上观点?( )
A.
有许多科学家正在研究这些动植物群
B.
许多动植物群在自然保护区里得到有效的保护
C.
动植物群的消失往往是自然选择的结果
D.
人们对生物多样性的保护意识越来越强
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