The adaptation of the sled dog best describes adaptation at the Population level while the dog exposed to seasonal colder temperatures has physiological modifications at the individual level.
Step-by-step explanation:
Adaptations are the special characteristic of animals and plants necessary for their survival in a particular climate. Sledge dogs are not pet and also does not come under wild animals category. These animals change their characteristics physically to survive in a particular weather.
Sledge dogs changes their fur, blood circulation, tongue, feet and tail to survive in winter.
The fur in the sledge dog has two coats. This helps them to adapt to extreme cold conditions. The fur in the outermost layer helps in expelling water. This will provide dryness to the dog. The fur that is the the next layer acts as an insulator and prevents the dog skin to lose heat. Thus, this adaptation describes the adaptation at population level and physical changes that its makes in its individual body to survive in cold temperatures.