Aves | Hindi | Diversity In Living Organisms | Biology | Class 9

Animals in the class Aves have a spindle-shaped body and the forearms modified into wings. They have an ossified skeleton and pneumatic bones (bones are hollow and have air cavities). They are homeothermic (warm-blooded animals). They have a four-chambered heart (two atria and two ventricles).
#aves #livingorganism #biology
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Why do we fall ill | Biology | Class 9: th-cam.com/play/PLy3rFQfaSxvY0MLqLaz7vL545nT_rths2.html

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Structural Organisation In Plants| Tissues | Biology | Class 9: th-cam.com/play/PLy3rFQfaSxvacereNxqs20pztUUM8v_Kg.html

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