Final answer:
The site in Tanzania famous for its hominin footprints preserved in volcanic ash is Laetoli, discovered by Mary Leakey. These 3.5 million-year-old footprints provide evidence of early hominin bipedalism.
Step-by-step explanation:
The site in Tanzania famous for its hominin footprints preserved in volcanic ash is Laetoli. Discovered by English paleoanthropologist Mary Leakey in the 1980s, the 3.5 million-year-old footprints provide important evidence of early hominin bipedalism. These footprints were likely made by Australopithecus afarensis and indicate a modern striding gait.