Question

ভাইরাস udviter kon kon rog sisty kora​

Answer 1

Answer:

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Stethoscope, medical instrument used in listening to sounds produced within the body, chiefly in the heart or lungs. It was invented by the French physician R.T.H. Laënnec, who in 1819 described the use of a perforated wooden cylinder to transmit sounds from the patient's chest (Greek: stēthos) to the physician's ear.