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When is demand perfectly elastic? When is demand perfectly inelastic? What are the values of the price elasticity of demand when demand is perfectly elastic or perfectly inelastic? What do perfectly elastic and perfectly inelastic demand curves look like?
Sponge
A simple aquatic creature with a porous body, or a soft, absorbent material used for washing and cleaning.
Type II Alveolar Cell
is a cell in the alveoli of the lungs that produces surfactant to reduce surface tension and prevent lung collapse.
Surfactant
A substance that reduces surface tension, in the lungs it prevents the collapse of alveoli during exhalation.
Gas Exchange
The biological process through which gases (like oxygen and carbon dioxide) are transferred between the bloodstream and the environment.
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