Answer:
the study of the structure, reaction, and composition of different kinds of substances
Explanation:
Factories, smoking, cars, littering
<span>The system proved suitable for patients with unilateral cleft lip and palate for whom the generated nasal mask continuous positive airway pressure remained constant between 5 to 7 cm of water but failed in the patient with bilateral cleft lip and palate. None of the patients had to be ventilated due to respiratory failure, and all survived to discharge.
Hope this helps
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Its probably personal beliefs or peers. because if your religion doesn't allow you to have sex until a certain age or until your married then that can get in the way. but peers pressure friends/people into doing things they aren't ready for
