Combining enormous physical strength with higher intelligence, the Neanderthals appear as equipped for facing any obstacle the environment could put in their path, but their relatively sudden disappearance during the Paleolithic era indicates that an inability to adapt to some environmental change led to their extinction.

• Aappear as equipped for facing any obstacle the environment could put in their path,  
• Bappear to have been equipped to face any obstacle the environment could put in their path,  
• Cappear as equipped to face any obstacle the environment could put in their paths,  
• Dappeared as equipped to face any obstacle the environment could put in their paths,  
• Eappeared to have been equipped for facing any obstacle the environment could put in their path,