Question

in the first drop - down box, select the root in the following term. then, in the second drop - down box, select the correct definition for that root. craniectomy (click to select) (click to select)

Explanation:

The root in "craniectomy" is "cran -" which comes from the Greek word "kranion" meaning skull. An -ectomy is a surgical removal. So the root "cran -" refers to the skull.

Answer:

First drop - down: cran -
Second drop - down: skull