The because it is a shifting zone between the tropics of cancer and capricorn where surface winds converge.

The  inter-tropical  convergence  zone  because  it  is  a  shifting  zone  between  the  tropics  of   cancer  and  capricorn  were   surface   wind  converge.

 The   inter   tropical  convergence  zone  is  a  belt  of  low  pressure   which   circle  the  earth  generally   near  the    equator. The  trade   winds  of  the  northern  and   southern  hemisphere  come together  at   this  zone   of  inter  tropical  convergence.

Ifound this on google “according to the findings, a foramen magnum positioned toward the base of the skull is found not only in humans, but in other habitually bipedal mammals as well.” i hope this you for what your looking for