根据现代生物进化理论，下列说法正确的是（ ）。
- A.微山湖中所有的鱼具有共同的基因库
- B.环境、突变及基因重组产生的变异为进化提供原材料
- C.生物多样性的形成过程也就是新物种不断形成的过程
- D.外来物种入侵能改变生物进化的速度和方向
正确答案及解析
正确答案
解析
基因库是指一个种群中全部个体的所有基因，而微山湖中所有的鱼不是一个种群，故A错误；突变(基因突变和染色体变异)及基因重组产生的变异为进化提供原材料，故B错误；生物多样性包括基因多样性、物种多样性和生态系统多样性，所以生物多样性的形成过程不仅仅是新物种的形成过程，故C错误；外来物种入侵会改变现有生物的生存状况，能使生物进化的方向和速度发生改变，故D正确。
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