The spread of H. erectus from tropical and subtropical climates into temperate zones was facilitated by all of the following EXCEPT

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Blade-toolmaking traditions are associated with later hominins, particularly Homo sapiens and Neanderthals, rather than with Homo erectus. The other options (B, C, D, E) are factors that would have facilitated the spread of H. erectus into temperate zones by improving their ability to hunt, protect themselves, cook food, and shelter.

The Spread of H