The continuation signal word "another" connects the idea that golden retrievers are a helpful dog breed to the idea that "German shepherds and border collies are known for their service to people."
Here’s the breakdown:
- "Another" signifies the introduction of a new example that continues the thought about helpful dog breeds, following the mention of German shepherds and border collies.
So, the correct connection is: German shepherds and border collies are known for their service to people.