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The shapes, forms, and behavior of complex life originate in the patterns that naturally occur by the crowding of cells resulting from the subdivision of the egg cell within its fixed spherical containing membrane.
Embryo geometry is the decoding of the origin of these patterns by the step-by-step topological analysis of the formation of the blastula, the ball of cells that begins all life, and by its deformation caused by continuing cellular proliferation during the event called gastrulation.
Evolution is the directed continuation of this process from simple beginnings within the constraint of the topology of subdividing spheres. Speciation results from small differences in the way this can happen.

The Origin of Complex Organic Form by Fluid Dynamics