Evolutionary psychologists also have an answer for why humans commit to one another , this they believe stems from the development of the human infants brain which was constrained during the time spent in the mother's womb due to shape of the pelvic girdle of the now upright human, this meant that the brain carried on developing long after its birth and so depended on the parents longer, because of this a greater commitment was needed from the father and so would be another trait looked for in a potential male. ... Once we are born the main concern of everyone around us is whether we are ...

• Word Count: 2036
• Approx Pages: 8
• Has Bibliography
• Grade Level: Graduate

Perrin discusses the use of the cotton root as a form of birth-control among the slaves. ... While it is nearly impossible to gauge whether the use of cotton root had a significant impact on birth rate from the evidence provided in Perrin's work, it is clear that women avoided and terminated pregnancies, at least in part, to defy their masters. ...

• Word Count: 1150
• Approx Pages: 5
• Has Bibliography
• Grade Level: Graduate