Final answer:
A.R.T, or Another Rough Tribe, were nomadic indigenous people who lived in harsh, drylands and are known for creating rock murals.
Step-by-step explanation:
A.R.T or Another Rough Tribe appears to refer to an indigenous group known for their nomadic lifestyle in the harsh, drylands. They were known for moving as needed to sustain their way of life, which included hunting and trading. This tribe has also left a mark on history through their creation of extensive murals on rocks, showcasing their artistic capabilities and contributing to our understanding of their culture and society.