Final answer:
Darwin's hypothesis for bipedalism in humans is that it evolved as an adaptation to a savanna habitat. His data consisted of analyzing creature's morphology and studying early hominin fossils, such as the Laetoli footprints.
Step-by-step explanation:
Darwin's hypothesis for bipedalism is that many human traits, such as upright bipedalism, evolved as adaptations to a savanna habitat. His data consisted of analyzing various aspects of creature's morphology, such as limb length and joint mobility, to determine how they moved. Additionally, the discovery of early hominin fossils provided evidence of early bipedalism, with the most famous example being the Laetoli footprints discovered by Mary Leakey.