物种灭绝的标准“Their proposed threshold for extinction was ten spec

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/09 18:09:42

物种灭绝的标准
“Their proposed threshold for extinction was ten species per million per year.”说的是“生物学家提出的物种灭绝的阈值为...”,哪位知道里面这个ten species per million per 每年每百万个物种还是每百万个生物中有10个物种灭绝?这是物种灭绝的门槛还是物种灭绝危机的门槛啊?

说的是在每一年,每一百个物种中就有十种灭绝
再问：感谢回答，不过为什么说per million，不说per hundred呢？
再答：因为是每一百万而不是每一百呀

物种灭绝的标准“Their proposed threshold for extinction was ten spec 物种灭绝的答案物种的灭绝已灭绝的物种什么样才叫物种灭绝?物种灭绝的概念是什么? 物种灭绝 All the members were s________ by the company for their spec 一个物种的灭绝,会导致哪几种动物灭绝物种灭绝的原因有哪些中国濒临灭绝的物种有哪些防止生物物种灭绝的措施栖息地对物种灭绝的影响