Final answer:
Evidence that contradicts the claim that Neanderthals were inefficient hunters includes isotope analysis, frequency of food stress, and body shape adaptation.
Step-by-step explanation:
There is evidence that contradicts the claim that Neanderthals were inefficient hunters. One piece of evidence is the isotope analysis, which shows that Neanderthals consumed meat at similar levels to contemporary carnivores, indicating that they ate plenty of meat. Another piece of evidence is the frequency of food stress, as indicated by bone growth. Neanderthals and modern Homo sapiens exhibit the same frequency of this stress, suggesting that Neanderthals were not less efficient hunters than modern humans. Additionally, Neanderal body shape was adapted to efficient hunting, which further supports the idea that they were skilled hunters.