Duchenne's muscular dystrophy is a sex-linked recessive disorder. Male children have weakness and degeneration of their muscles. Weakness begins in the arms and legs and progresses to the entire body. By age 12 children are usually wheelchair bound, with death occurring by age 15, typically from lung disorders.

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

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