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Why the land animals have respiratory organs inside the body ?


The respiratory organs are present inside the body to check the rate of evaporation of water.
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Why food does not enter trachea ?

Name the two centres responsible for the regulation of respiratory rhythm. 

Why foetal haemoglobin has more affinity for O2 than mother’s haemoglobin ?

Exchange of gases continue to occur even during expiration, give reason.

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