Los principales compuestos composicionales de la cáscara se conocen como Carbonato de Calcio que ayuda a fortalecer la estructura que la ayuda del elemento fósforo.
ENGLISH
The main compositional compounds of the shell are known as Calcium Carbonate that helps in strengthening the structure which the help of phosphorus element.
Population age structure is a summary of the number of individuals of each age in the population. An example is, In 2002, 30% of the worlds population was under 15 years old. <span />
