简述达尔文生物进化论的基本观点,并阐述捉出这一学说的意义。
基本观点:达尔文认为进化的原因是生存斗争和自然选择。在自然选择的过程中中,被选择的有利性状,将在世代遗传过程中逐渐积累,由较小的变异转变为较大的变异,逐渐变成新的物种。
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