Answer:
Step-by-step explanation:
The environments are different because the environment that Buck was in first in the beginning of chapter one was a big house called Judge Miller's place, where he was a very high status in his eyes. He was the "king" of that house. He was the "king" and ruled over everything, including the humans there. He was loyal to Judge Miller but despite being a little egotistical, he was not pampered and instead hardened his muscles. He was very familiar with the environment here. However, in the environment he was in in the end of chapter one, he was not so familiar. He was in a cold snowy environment, and he had yet to find out what snow was. In the journey there, he learned to obey the "man with the club", and that here it was survival of the fittest. In the end, he had adapted to his new environment, and learned what not and what to do to survive.