可知,动物天敌的猎食对一些濒危蛙类造成了巨大威胁;根据Marilyn Connell部分的Being hunted by other wildlife is the Mary River turtle's biggest threat(被其他野生动物猎杀是玛丽河海龟最大的威胁)可知,来自其他物种的威胁影响了青蛙和玛丽河海龟的生存。故选D。
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