Final answer:
Possible bipeds or hominins in the Miocene period include Australopithecus and Homo erectus.
Step-by-step explanation:
In the Miocene period, possible bipeds or hominins include Australopithecus and Homo erectus. Fossil evidence shows that these hominins were walking upright, indicating bipedalism. For example, Mary Leakey discovered footprints made by bipedal individuals, likely Australopithecus afarensis, at the site of Laetoli. Additionally, Homo erectus had anatomical features, such as a broad pelvis, longer legs, and arched feet, that suggest efficient bipedal locomotion.