Final answer:
A central idea of "Big Wolves and Ordinary Wolves" likely involves the exploration of relationships between humans and wolves, conflicts between the natural environment and human interests, and the consequences of human actions on wildlife.
Step-by-step explanation:
The sentence that expresses one central idea of "Big Wolves and Ordinary Wolves" could potentially highlight the dynamic between different characters such as humans and wolves or the tensions between the natural world and human activities. For instance, contrasting the wolf-dog and the unnamed man in Jack London's story might reveal insights into their relationship with their environment and each other. Additionally, discussions about wolf reintroduction reflect ongoing debates between environmental activists who support it and cattle ranchers and hunters who oppose it, illustrating the complexity of human-animal relationships.