Que elemento proporcionan fuerza a los exoesqueletos de alemejas y ostras?​

    SPANISH

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.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

airlines i think? or a cruise boat? does this work out for u? ?