**Core Concept**
A male skull typically exhibits certain distinctive features compared to a female skull, primarily due to the influence of sex hormones and genetic factors during fetal development. The differences can be observed in the cranial and facial bones, with males generally having larger and more robust features.

**Why the Correct Answer is Right**
The correct answer is related to the fact that male skulls tend to have a larger mastoid process, a more pronounced nuchal line, and a larger sagittal crest, which is a bony ridge along the midline of the skull. These features are a result of the increased muscle mass and bone density in males. The sagittal crest, in particular, is a characteristic of male skulls and is associated with the attachment of the temporalis muscle.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because male skulls do exhibit a larger mastoid process, which is a characteristic feature of males.
**Option B:** This option is incorrect because male skulls tend to have a more pronounced nuchal line, which is a bony ridge at the back of the skull.
**Option C:** This option is incorrect because male skulls are generally more robust and have a larger sagittal crest, which is a characteristic of males.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the differences between male and female skulls are subtle and can be difficult to distinguish in some cases. However, the presence of a sagittal crest is a reliable indicator of a male skull.

**Correct Answer:** D.