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Mary Leakey, Louis Leakey, and Donald Johanson have made significant contributions to our understanding of human origins through their discoveries of important fossil hominins. Mary and Louis Leakey discovered the earliest known hominin footprints at Laetoli, Tanzania, providing insights into bipedal locomotion. Donald Johanson discovered the famous "Lucy" fossil in Ethiopia, which belongs to the species Australopithecus afarensis and has expanded our knowledge of early human evolution.

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Q: How have Mary Leakey Louis Leakey and Donald Johnson contributed to our knowledge of human origins?
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