Which bone is the only one that's not connected to another? A: the skull B: the cuboid C: the hyoid D: abdominal ribs E: sternum

5. What is the key difference that separates human beings from chimpanzees: A: Hidden ovulation B: Reduced masticatory system C: The decent of the hyoid bone D: Bipedalism E: Creativity F: None of the above G: All of the above