Occipital and Frontal are part of cephalic regions
The cephalic region (head) or cranial region (skull) is at the top of the body and visible from the front and rear. The cervical region (neck) starts below the head, ends at the thorax, and is visible from the front and rear from below the head to the shoulders.
a. possible errors
d. new questions
predictions and planning happen before. a summery comes after. errors you get after investigation and new questions propose what you can look for in the future.
the answer for apex is "1 and 6"