题目内容：
下列有关生物多样性的描述，正确的是（）
A.生物多样性的保护对于保持生态平衡和生态系统稳定性意义重大
B.生物多样性包括遗传多样性、个体多样性和生态系统多样性几个层次
C.大量排放C02导致全球变暖和普降酸雨是引起物种灭绝的主要原因
D.引进外来物种不会对自然界生物多样性造成根本影响
参考答案：
选择题：下列有关生物多样性的描述，正确的是（）
- 题目分类：中国大学MOOC慕课
- 题目类型：选择题
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