 | Key Terms
| foramen magnum | The hole in the base of the skull through which the spinal cord emerges and around the outside of which the top vertebra articulates.
| | | | | prognathism | The jutting forward of the lower face and jaw area.
| | | | | sagittal crest | "A ridge of bone, running from front to back along the top of the skull, for the attachment of chewing muscles."
| | | | | knuckle walking | "Walking on the backs of the knuckles of the hand, typical of the African apes."
| | | | | competitive exclusion | When one species outcompetes others for the resources of a particular area.
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