Mobility aids help you walk or move from place to place if you are disabled or have an injury. You may need a walker or cane if you are at risk of falling. If you need to keep your body weight off your foot, ankle or knee, you may need crutches. You may need a wheelchair or a scooter if an injury or disease has left you unable to walk. Choosing these devices takes time and research. You should be fitted for crutches, canes and walkers. If they fit, these devices give you support, but if they don't fit, they can be uncomfortable and unsafe.
Primate-like Mammals. The first primate-like mammals, or proto-primates , evolved in the early Paleocene Epoch (65.5-55.8 million years ago) at the beginning of the Cenozoic Era. They were roughly similar to squirrels and tree shrews in size and appearance.
At present, the leading contender for that ancestral species is Australopithecus garhi or possibly Australopithecus africanus. There may have been one or possibly two species of the first humans living in East Africa--Homo rudolfensis and Homo habilis.he differences between australopithecines and early humans are most noticeable in the head. Humans developed significantly larger brains and relatively smaller faces with progressively smaller teeth and jaws.