生物链的重要性
<p>在浩瀚的宇宙中，有一颗美丽的星球，之所以它会显得这样美丽，是因为那复杂多样的生物链使它富有生机，富有力量。但是，如果我们的生物链被毁坏，那在这无穷无尽的宇宙中还是否可以找到这颗美丽的星球呢？</p><p><span word="In">In</span> <span word="the">the</span> <span word="vast">vast</span> <span word="universe">universe</span>, <span word="there">there</span> <span word="is">is</span> <span word="a">a</span> <span word="beautiful">beautiful</span> <span word="planet">planet</span>. <span word="The">The</span> <span word="reason">reason</span> <span word="why">why</span> <span word="it">it</span> <span word="looks">looks</span> <span word="so">so</span> <span word="beautiful">beautiful</span> <span word="is">is</span> <span word="that">that</span> <span word="the">the</span> <span word="complex">complex</span> <span word="and">and</span> <span word="diverse">diverse</span> <span word="biological">biological</span> <span word="chain">chain</span> <span word="makes">makes</span> <span word="it">it</span> <span word="full">full</span> <span word="of">of</span> <span word="vitality">vitality</span> <span word="and">and</span> <span word="strength">strength</span>. <span word="But">But</span> <span word="if">if</span> <span word="our">our</span> <span word="biological">biological</span> <span word="chain">chain</span> <span word="is">is</span> <span word="destroyed">destroyed</span>, <span word="can">can</span> <span word="we">we</span> <span word="find">find</span> <span word="this">this</span> <span word="beautiful">beautiful</span> <span word="planet">planet</span> <span word="in">in</span> <span word="this">this</span> <span word="endless">endless</span> <span word="universe">universe</span>?</p><p>从古到今，世界上的所有生物都是相互依赖，共同存亡的，因此，1927年时，英国动物学家埃尔顿首次提出了这个名词“生物链”。那究竟什么是生物链呢？通俗地讲，就是由动物、植物和微生物互相提供食物而形成的相互依存的链条关系。而这，在生态学上就被称为生物链。</p><p><span word="From">From</span> <span word="ancient">ancient</span> <span word="times">times</span> <span word="to">to</span> <span word="the">the</span> <span word="present">present</span>, <span word="all">all</span> <span word="living">living</span> <span word="things">things</span> <span word="in">in</span> <span word="the">the</span> <span word="world">world</span> <span word="are">are</span> <span word="interdependent">interdependent</span> <span word="and">and</span> <span word="exist">exist</span> <span word="together">together</span>. <span word="Therefore">Therefore</span>, <span word="in">in</span> 1927, <span word="British">British</span> <span word="zoologist">zoologist</span> <span word="Elton">Elton</span> <span word="first">first</span> <span word="proposed">proposed</span> <span word="the">the</span> <span word="term">term</span> "<span word="biological">biological</span> <span word="chain">chain</span>". <span word="What">What</span> <span word="is">is</span> <span word="the">the</span> <span word="biological">biological</span> <span word="chain">chain</span>? <span word="Generally">Generally</span> <span word="speaking">speaking</span>, <span word="it">it</span> <span word="is">is</span> <span word="an">an</span> <span word="interdependent">interdependent</span> <span word="chain">chain</span> <span word="relationship">relationship</span> <span word="formed">formed</span> <span word="by">by</span> <span word="animals">animals</span>, <span word="plants">plants</span> <span word="and">and</span> <span word="microorganisms">microorganisms</span> <span word="providing">providing</span> <span word="food">food</span> <span word="for">for</span> <span word="each">each</span> <span word="other">other</span>. <span word="This">This</span> <span word="is">is</span> <span word="called">called</span> <span word="the">the</span> <span word="biological">biological</span> <span word="chain">chain</span> <span word="in">in</span> <span word="ecology">ecology</span>.</p><p>生物链的毁坏，首先是因为它的自然原因。，就比如，如果一种有毒物质被被草吸收，虽然含毒量浓度很低，不影响草的生长，但兔子吃草后有毒物质很难排泄，当因为它经常吃草，有毒物质会逐渐在它体内积累，而鹰吃大量的兔子，有毒物质会在鹰体内进一步积累。因此食物链有累积和放大的效应。</p>
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