In Velella the pneumatophore becomes of complex structure and sends air-tubes, lined by a chitin and resembling tracheae, down into the compact coenosarc, thus evidently serving a respiratory as well as a hydrostatic function. [Please select]
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Why does a nereis need more respiratory surface than an earthworm does. [Please select]
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A diagram of the respiratory tract from the nostrils to the lungs, by arrows showing the course of the air. [Please select]
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Where do you think the external openings of the respiratory organs of the larva and those of the pupa are located. [Please select]
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#Tra' che a#, a tube which carries air either to the respiratory organ or to the tissues.' [Please select]
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The luminescence, therefore, is controlled by the respiratory organs and the work produced is an oxidation. [Please select]
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, the nervous, digestive, circulatory, and respiratory systems, differ in their position in relation to the walls of the body. [Please select]
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The pupa is also aquatic, having long respiratory filaments attached to each side of the front of the thorax. [Please select]
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They rise to breathe every 70 to 150 seconds, and the respiratory act is so rapid that it requires a very expert marksman to take aim and fire before the animal disappears. [Please select]
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