Answer:
Its C
Explanation:
Surfactant lowers surface tension at the air-liquid interface and thus prevents alveolar collapse at end-expiration.
The answer is <span>operational definition.
Operational definitions it is a dubious in the fields of brain science and psychiatry, where natural ideas, for example, insight should be operationally characterized before they wind up noticeably manageable to logical examination, for instance, through procedures, for example, IQ tests.
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Yes that is true ask me more questions glad to help .
