Respiratory technicians are trained to prescribe medicine.
perform surgery.
perform tests.
give direction to pulmonologists.

Measure lung capacity to determine a patient's condition. Educate patients about their conditions and the proper use of therapeutic equipment. Provide basic treatments for diseases such as asthma, emphysema, and COPD. Take notes and keep records of patients' treatments and prognoses.

Explanation:

What Respiratory Therapists Do. Respiratory therapists interview and examine patients with breathing or cardiopulmonary disorders. Respiratory therapists care for patients who have trouble breathing—for example, from a chronic respiratory disease, such as asthma or emphysema.

when comparing the cases, what similarities are there in the cases that suggest one person committed these murders?

the answer is a