answer; ///i do believe that the correct answer is (a); //they are not
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when emphysema develops, the alveoli and lung tissue are destroyed. with this damage, the alveoli cannot support the bronchial tubes. the tubes collapse and cause an “obstruction” (a blockage), which traps air inside the lungs. too much air trapped in the lungs can give some patients a barrel-chested appearance.
she called it to assist her friend