Definition: If a type of animal is extinct, it does not now exist. Level: C1
这些生物可能很快就会灭绝。
These creatures could soon be ___extinct.
人类活动可能导致许多物种灭绝。
Human actions could cause many species to become ___extinct.
恐龙是一个已灭绝动物群体的例子。
Dinosaurs are an example of an ___extinct animal group.
