A quote to show Buck's determination? A quote to show Buck's survival abilities? A quote to show Buck's adaptiveness?

Determination;

He was glad for one thing: the rope was off his neck. That had given them an unfair advantage; but now that it was off, he would show them. They would never get another rope around his neck. Upon that he was resolved. (1.25)

Survival;

That club was a revelation. It was his introduction to the reign of primitive law, and he met the introduction halfway. The facts of life took on a fiercer aspect; and while he faced that aspect uncowed, he faced it with all the latent cunning of his nature aroused. (1.40)

Adaptiveness;

And not only did he learn by experience, but instincts long dead became alive again. The domesticated generations fell from him. In vague ways he remembered back to the youth of the breed, to the time the wild dogs ranged in packs through the primeval forest and killed their meat as they ran it down. . . . Thus, as token of what a puppet thing life is the ancient song surged through him and he came into his own again. . . .