The pseudotrachea of a housefly is formed by:

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(A) The proboscis of a housefly consists of three parts: the rostrum,the haustellum,and the labella. The labella are two oval,fleshy lobes at the dist

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Labella

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(A) The proboscis of a housefly consists of three parts: the rostrum,the haustellum,and the labella. The labella are two oval,fleshy lobes at the distal end of the proboscis. These lobes are traversed by a series of fine,semi-circular channels known as pseudotracheae,which resemble the tracheae of insects in appearance and function to collect liquid food.

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