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During rest the breathing occurs rhythmically at the frequency of _________ times per minute in human?
___________ respiration is the process by which cell utilized oxygen and produces CO2 ?
Lungs are covered with double layered thin membranous sac called______?
___________ respiration is directly involved in the production of energy, necessary for all living activities?
Lungs are spongy due to the presence of million of______?