Reread this excerpt from The Call of the Wild. It was no task for him to learn to fight with cut and slash and the quick wolf snap. In this manner had fought forgotten ancestors. They quickened the old life within him, and the old tricks which they had stamped into the heredity of the breed were his tricks. They came to him without effort or discovery, as though they had been his always. And when, on the still cold nights, he pointed his nose at a star and howled long and wolflike, it was his ancestors, dead and dust, pointing nose at star and howling down through the centuries and through him.

What is the meaning of this excerpt?

Buck considers wild dogs his family, and they visit his campsite.
As Buck lives in the wild, he summons his natural instincts for survival.
As Buck becomes accustomed to trail life, he howls contentedly.
Buck is learning how to fight and howl from the dogs on his team.