Some scientists hypothesize that the extinction of the dinosaurs resulted from the effects of an asteroid collision with Earth.
一些科学家假定，小行星撞击地球导致了恐龙的灭绝。
2
Those unable to match the migration speeds needed to escape the effects of global warming could vanish into extinction.
如果跟不上逃避全球变暖影响所需的迁移速度，那些动植物有可能会灭绝。
3
Modified organisms may interbreed with natural organisms and out-compete them, leading to extinction of the original organism or to other unpredictable environmental effects.