c) Humans can stand on their feet and have an erect posture. Why ?
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because we have a backbone
Explanation:
Scattered across a taupe-coloured slab of rock that emerges from the bed of a dried-up river in northern Tanzania are perhaps some of the most evocative relics of our evolutionary past.
Pressed into the hardened volcanic ash are three sets of footprints. The larger ones apparently lead the smaller ones along a trail that meanders for 27m (88ft) across the once-powdery surface. They were made by a species of early human that strolled confidently through the area about 3.66 million years ago, long before our own species, Homo sapiens, walked the Earth.
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Answer:
Because humans have backbone
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