Final answer:
To complete the analogy scalpel:incision::, we look for a tool and its corresponding action, such as pen:writing or brush:painting.
Step-by-step explanation:
The analogy scalpel:incision:: is asking us to identify a tool and the action it performs, similar to how a scalpel is used to make an incision. To complete the analogy, we need to find another pair of words where the first is a tool and the second is the action that tool performs. For example, pen:writing or brush:painting would complete the analogy because a pen is used for writing and a brush is used for painting, just as a scalpel is used to make an incision.