Systems have a membrane that separates the internal chemicals from the external chemical environment.

Living systems have a membrane that separates the internal chemicals from the external chemical environment. 

Living organism has to keep their internal chemical level so they need to make a membrane that separates it from the external chemical environment. 

Plants, sunlight, growth and artificial sunlight

The 3 steps are vasoconstriction, temporary blockage of a platelet plug, formation of a fibrin clot better known as coagulation.