... littoral environment滨海环境 live species活物种；现有物种 livestock buildings饲养家畜建筑物 ...
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各个物种的灭绝原因都不相同，而且找不到任何遗传特性来区别灭绝物种与存活物种。
The extinctions differ from species to species, and we don't find any common genetic characteristic to distinguish extinct from surviving species.
长度可达18米（60英尺）的北太平洋东部露脊鲸，数目远在50以下， 低于世界自然保护联盟作为一个可能存活物种的起码数量。
Numbering well under 50, the eastern North Pacific right whale --which can reach up to 18 metres (60 feet) in length -- falls below theIUCN's threshold of likely viability as a species.
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