Respiration+&+Digestion

Air enters the birds nostils located beside the base of the beak.The air pases down the trachea and enters the bronchi,some of the air moves to the lungs.then about 3/4s of the air by passes the lungs and flowscdirectly to posterion air sacs.their specialized respiratory structures are posterion and anterion sacs.Their speciallized respiratory figures are posterion and anterion sacs.Digestion-Birds dont have teeth,instead food passes from the mouth cavity straight to the esophagus.
 * R**[[image:ill_bird_airsacs.gif width="254" height="211"]] ​Birds-respiratory

Fish-respiratory The large surface area of a fishes gills allows for rapid gas exchange.Counter current flow causes more oxygen to diffuse into the blood than would be possible if blood and water flowed in the same direction.a fishes kidneys filters dissolved chemical wastes from the blood. the organism with a large surface area,gas exchange occurs quickly.

Reptile-Respiratory Reptile fills its lungs by expounding its rib cage.This expusnion reduces the pressure within the throux and draws air into the lungs.when the thorus increases,and air os forced out of the lungs.smiliar movenments help humans to breath.theor speacilized structures is the alveoi

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