Read the excerpt from "Husky-The Wolf Dog of the North." But the husky is far from uninteresting. As a type of endurance, no better evolved product of natural selection need be sought. If ever a species has been born and bred of hard times, it has. Only the fittest, in a struggle for existence extending through a thousand thousand generations, have survived. And they are well fit. Which best states the central idea in this excerpt? Huskies are hardy, powerful animals. Huskies have existed for generations. Huskies are a species of dog. Huskies have survived hard times.

Huskies have survived hard times.

Explanation:

Jack London's essay "Husky-The Wolf Dog of the North" gave a detailed description and introduction to the dog family more familiar in the snowy mountainous regions, especially the Yukon areas. This essay also acts as a guide into the lives of the huskies, who are more resilient and useful in these snowy parts unlike the normal dogs.

The given excerpt is from the second paragraph of the essay which talks of the endurance and resiliency of the husky breed. By using the words "in a struggle for existence extending through a thousand thousand generations, have survived", London focuses on the hard times that huskies had endured to be here.

Thus, the correct answer is that the central idea of the excerpt can best be said that the huskies had survived hard times.