90891
Geotextiles have been used to protect the fossil hominid footprints of Laetoli in Tanzania from erosion , rain , and tree roots .
 Laetoli, Tanzania, tree
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, tree