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Prevent air from entering the potential space in the pariatal lining and collapsing the lung.
A true monopolist will charge a VERY LOW price, so as to cause his competitors to go out of business. Then, when other companies have given up, he'll raise his prices. But in a free economy, he can't raise prices TOO high, for fear of attracting new entrants to the market. So a monopolist will invariably team up with market regulators to prevent new competition from arising. The Example of the Year of this phenomenon is the taxicab alliance supported by taxicab regulators, trying to prevent Uber and Lyft from stealing the taxi market with lower prices and better service,
Monopoly and Oligopoly are two barriers that prevent firms from entering the marketplace.
Shutting it.
Driveway gates can serve multiples purposes. First, it can prevent other drivers from using the driveway to turn around, thus preventing markings on the cement. Second, it can prevent children from running out into the street. And third, it can prevent potential car thieves from entering the driveway to steal a car.
Epiglottis
no
to prevent from liabilities
Phospholipids in the cell membrane prevent water from entering a cell.
Phospholipids in the cell membrane prevent water from entering a cell.
to close windows and doors
It is to prevent dust from wood from entering your eye.