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  1. CHON es un acrónimo mnemotécnico de los cuatro elementos más comunes en los organismos vivos: carbono, hidrógeno, oxígeno y nitrógeno.. El acrónimo CHNOPS, que significa carbono, hidrógeno, nitrógeno, oxígeno, fósforo, azufre, representa los seis elementos químicos más importantes cuyas combinaciones covalentes constituyen la mayoría de las moléculas biológicas en la Tierra. [1]

  2. The 1640s in particular saw more state breakdowns around the world than any previous or subsequent period. [page needed] [page needed] The Polish–Lithuanian Commonwealth, the largest state in Europe, temporarily disappeared. [citation needed] In addition, there were secessions and upheavals in several parts of the Spanish Empire.

  3. The Scarlet Letter: A Romance is a work of historical fiction by American author Nathaniel Hawthorne, published in 1850. Set in the Puritan Massachusetts Bay Colony during the years 1642 to 1649, the novel tells the story of Hester Prynne, who conceives a daughter with a man to whom she is not married and then struggles to create a new life of repentance and dignity.