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【单选题】
有关研究显示，物种之间的相互影响十分紧密。一个物种的消失，一般可影响5到20个物种的功能与生存。每一种鸟类的消失，有大约90种昆虫、35种植物、2到3种鱼类随之灭绝。每两种鸟类消失，则必然会有一种哺乳动物随之灭绝。这说明（）
A.
自然界的事物变化万千，人们不可捉摸
B.
自然界的事物是客观存在的，和人类的活动无关
C.
自然界的事物是按照自身所固有的规律形成和发展的
D.
物质是不依赖于人的意识，并能为人的意识所反映的客观实在
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