1. The hypothesis[主句(主语)] that begging calls have evolved properties[同位语从句1] that reduce their potential for attracting predators[定语从句1] yields a prediction:[主句] baby birds of species that experience high rates of nest predation[定语从句2] should produce softer begging signals of higher frequency than nestlings of other species less often victimized by nest predators.[同位语从句2(主语)]

2. One possibility is[主句] that a noisy baby bird provides accurate signals of its real hunger and good health,[表语从句] making it worthwhile for the listening parent to give it food in a nest[现在分词短语作伴随状语] where several other offspring are usually available to be fed.[定语从句]

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