Why is Buck concerned about being with Hal, Charles, and Mercedes? He is worried that they will attack. He fears they will not be able to take care of him and the other dogs. He thinks they will sell him to someone who is worse than his previous owners. He is afraid that they will strip him of his role as lead dog.

He fears they will not be able to take care of him and the other dogs

Explanation:

Why is Buck concerned about being with Hal, Charles, and Mercedes

Buck is concerned about being with Hal Charles, and Mercedes because he knows that they are incompetent and not fit to lead a sled of dogs.

The trio are inexperienced about handling dogs on a sled and Buck is worried and concerned because he fears he and the other dogs in the sled will not be taken care of.

- "chilles is sad and angry because hector, the trojan leader, killed his best friend patroclus. he seems angry with himself because he didn't or protect patroclus against the trojans."