What was true of the hypothesis of the research?A) Our apelike ancestors were anatomically different but had the same gaits.B) Bipeds with natural selection had an advantage over quadruped.

• 这些差异在自然选择的过程中决定了遗传变异，而环境变化使得两足行走的猿人比起四足行走的猿人更有优势。