Sled Dogs Have a Thick Coat of Hair That Helps

Sled dogs have a thick coat of hair that helps them withstand the cold temperatures of the Arctic.Compare that adaption to a single,unrelated dog that grows a thicker coat in the fall in response to colder temperatures.The adaptation of the sled dog best describes adaptation at the ________ level while the dog exposed to seasonal colder temperatures has ________.

A) regional;natural selection at the individual level
B) individual;physiological modifications at the population level
C) population;physiological modifications at the individual level
D) species;natural selection at the population level
E) ecosystem;physiological modifications at the individual level