Final answer:
The Gravettian and Eastern Gravettian cultures were Paleolithic cultures that relied on the mammoth steppe ecosystem for survival. They were skilled hunters who used mammoth bones and tusks to create tools, weapons, and artwork.
Step-by-step explanation:
The Gravettian and Eastern Gravettian were two cultural periods that existed during the Paleolithic era in Europe. These cultures were part of the larger Upper Paleolithic culture and were characterized by their reliance on the mammoth steppe ecosystem for survival. The mammoth steppe was a vast grassland ecosystem that supported large herds of mammoths, along with other animals that were hunted for food and materials. The people of the Gravettian and Eastern Gravettian cultures were skilled hunters who used the bones and tusks of mammoths to create tools, weapons, and artwork.