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Important human trace fossils are the Laetoli ( Tanzania ) footprints , imprinted in volcanic ash 3.7 Ma ( million years ago ) -- probably by an early Australopithecus .
 Laetoli, Tanzania, Australopithecus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Laetoli, Tanzania, Australopithecus