'Oxygenated air' diaporamas de présentation

Birds

Birds. Kingdom. Kingdom= Animalia Phylum= Chordate Class= Aves. Birds. Ornithology is the study of birds. Birds belong to the class Aves Birds 1 st appeared on the earth about 150 million years ago. There are about 10,000 species of birds in the world. Birds developed from reptiles.

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Respiratory System

Respiratory System. Functions of the Respiratory System. Brings Oxygen into the blood. Removes Carbon Dioxide from the blood stream. Pulmonary Ventilation: Exchange of air between external environment and the air sacs of the lungs.

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