12. How is oxygen and carbon dioxide transported in human being!
13 Dras yell labeled diagram of human alimenta
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Haemoglobin transports oxygen molecule to all the body cells for cellular respiration . This deoxygenated blood gives CO2 to lung alveoli and takes O2 in return.
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12. because of trees, tree gives us (humans) oxygen and take carbon dioxide from us.
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save trees
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