While there is evidence that dogs have been domesticated for over 15,000 years, one theory is that dog species first evolved from wolves through natural selection. Today, there are over 400 domesticated dog breeds which range in all shapes and sizes. It is claimed that the breeds we recognize today are the direct result of selective breeding, rather than natural selection.
Which of the following pieces of evidence BEST supports selective breeding?
A
Certain dog breeds have a thick coat of fur which allows them to adapt to colder climates found in certain regions.
B
Certain dog breeds have shortened legs which make them ideal hunting companions, particularly for animals which burrow in holes.
C
Wolves and early dog breeds developed specific genes to metabolize the starch found in human diets which allowed them to be domesticated.
D
Wolves which were bold and friendly stayed close to humans which led to their eventual domestication. Those which were aggressive remained wild.