While sled dogs share some physical characteristics with wolves, such as thick fur, these characteristics have simply been selected for because they are necessary for a dog's survival in the Arctic.
(sled dogs; share; some physical characteristics with wolves, such as thick fur) (these characteristics; have simply been selected; for; because they are necessary) (they; are; necessary)
sled dogs these characteristics they
share have simply been selected are
some physical characteristics with wolves, such as thick fur
for because they are necessary
necessary