Final answer:
The hypotheses proposed to explain the origin of primate adaptations include the arboreal theory, visual predation hypothesis, and angiosperm theory. These theories propose that primates evolved traits such as grasping hands and forward-facing eyes as adaptations to their environments, either in the trees or in response to food resources provided by flowering plants.
Step-by-step explanation:
The hypotheses proposed to explain the origin of primate adaptations include the arboreal theory, the visual predation hypothesis, and the angiosperm theory.
The arboreal theory suggests that primates evolved their traits as adaptations to life in the trees, such as thumbs and big toes for grasping branches.
The visual predation hypothesis proposes that primate features evolved as adaptations for hunting insects and small prey in forest undergrowth and the forest canopy.
The angiosperm theory states that primate traits developed in coevolution with the rise of flowering plants, providing resources like fruits, seeds, and nectar.