Chuck didn't quit up when Duke passed away because Duke's efforts were what had allowed Chuck to rise up again. He couldn't allow Duke's labor of love be for nothing. Chuck persisted in his efforts, and after a few weeks—as though in particular honor of Duke—he was named Assistant National Sales Manager. To honor Duke's memory, he was obligated to continue. No, Chuck carried on with his work and daily activities while Duke was by his side. He had come to understand the dog's profound love, commitment, and patience in helping him regain his footing, and he could not allow all of that work to be in vain.
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Answer:
Since they didn't have access to advanced stone tool technologies, they were forced to scavenge meat off larger and stronger predators. Humans weren't fast or strong, disadvantaging them in the food chain. However, as they advanced technologically, they were able to rise up the food chain.
Explanation:
