At least how many hours of sleep do students ages twelve to eighteen need per night? seven
eight
nine
ten

What is the purpose of certification for musculoskeletal careers? present awards for specialization and training in particular areas of the body grant confirmations of competence to perform a particular task earn credentials that grant a provider permission to practice in a particular field provide evidence of continuing medical education following formal training

How does heroin affect cellular communication in the brain?

How do nicotine and tobacco cause cancer? by decreasing blood-sugar levels by damaging or changing a cell's dna by increasing heart rate by increasing phlegm and mucous production