The word in paragraph 4 means that buck shows determination in the story call of the wild is "dominant primordial beast"
<h3>How does Buck in Call of the Wild come to be?</h3>
In The Call of the Wild, tenacity is fundamentally about supremacy and secondarily about survival. In addition to wanting to live, Buck is also driven to take charge, as well as finish certain chores, kill particular species, and also demonstrate his leadership abilities.
After being abducted from California in Jack London's novel The Call of the Wild, Buck learns how to survive as a sled dog in the Yukon. In order to search for gold in Canada and Alaska during the Klondike Gold Rush, men rode sleds hauled by dog teams in severely cold conditions.
Note that the dominant primordial beast is one that was said to be very strong in Buck and thus it is the word that qualifies him.
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