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1.
Each haemoglobin molecule can carry maximum of
2.
Hypoxia is caused due to
3.
During oxygen transport, the oxyhaemoglobin at the tissue level liberates oxygen to the cells because
4.
exchange with 
by simple diffusion over the entire body surface takes place in
I. sponges
II. Coelenterates
III. Flatworms
Select the correct option to complete the given statement
exchange with by simple diffusion over the entire body surface takes place inI. sponges
II. Coelenterates
III. Flatworms
Select the correct option to complete the given statement
5.
Breathing involves ...A... during which atmospheric air is drawn in and ...B... by which the alveolar air is released out.
Choose the correct option for A and B to complete the given NCERT statement
Choose the correct option for A and B to complete the given NCERT statement