The fertized egg does a mono-polar invagination to created the three germ layers, ecto, endo, meso.
The cosmic egg ---as a torus ( )( )---- is Gravity-Dark Energy space part of space-time and observed time { quantised } is the di-polar invagination {><)(><) to create, 0,3,6,9,15,18 etc sine-wave / \ / \ / \ / pattern, inside the space torus and the 3D, volumetric body-of-time ergo (> * <)(> * <) ergo,
bilateral consciousness/othernerss/awarness aka twoness, i.e.
Hi, I am Womb \/\*/\*/\/............/*\/*\ Hi, I am Man
Womb being the most complex spirit and man being the 2nd most complex spirit of Universe
Positive curvature ---the outer surface womb and egg of nodal events---- is the cosmic Gravitationa { attractive/contractive/pulling-in } fermale.
Negative curvature ---the inner surface pushing out spermazoa of nodal events--- is the cosmic Dark Energy { pushing-out } of male.
The real question is why does positive and negatively cuvred Gravity-Dark Energy invaginate.
...>>...\/\/\/\*/\*/\/\/\/\......>>....../\/*\/*\/\.......
On Earth, more complex woman { Xx } came before less complex man { Xy }, if such creation ever occurred. This is complex-to-simple evolution.
Any man before woman ---simple-to-complex--- is non-sensical. y does not evolve into X.
Simple-to-complex
is a more frustrating evolutionary process, and nature likes to take
the path of least resistance ex Gravity takes the path of least
resistance.
The proof is in the pudding, however, some pudding is more superficial than others.