WHY do some people possess webbing between their toes? This feature is found in only a small number of people and stems from the course of embryonic development.
The formation of a limb begins with a rounded projection. It grows, its end expands and flattens. Inside the "plate", muscles and bones are formed.
Separation of the fingers occurs as a result of mass death of the cells of the connecting tissue.
Some mutations cause the cells not to die and develop into a membrane. And in animals transitioning to a near-water lifestyle, the webbing is picked up by selection and becomes a species trait.
