第四纪冰期，使许多物种绝灭。
Pleistocene glaciation caused the extinction of many species.
第四纪冰期，使许多物种绝灭。
国际自然资源保护联盟的物种生存委员会是世界最大的与物种绝灭做斗争的保护专家网。
Species Survival Commission is the world's largest network of conservation experts dedicated to fighting the species extinction crisis.
据信，在1550年至1950年之间，平均每年就有一种生物绝种，到了1985年，则上升到每天有一个物种绝灭。
It is thought that between the years 1550 and 1950 an average of one kind of living thing died out each year. By 1985 this had risen to one per day.
物种濒危和绝灭不是随机的。
Species endangerment and extinction does not occur at random ecologically.
各种人为干扰和自然因素促使大量物种走向濒危和绝灭。
Many species have become endangered and extinct because of natural and factitious factors.
在沙漠化过程中植物种的绝灭速率大于定居速率。
The extinction rate of plants in this area is higher than their colonization rate.
原来的物种虽然绝灭了，但其基因则被一个新的门类所继承。
Although the original species has _____ _____, its genes are carried by the new group.
原来的物种虽然绝灭了，但其基因则被一个新的门类所继承。
Although the original species has _____ _____, its genes are carried by the new group.
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