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Which of the following group represent t...

Which of the following group represent the correct sequence of steps in respiration
A.Breathing `to` Gaseous exchange at lungs `to` Gaseous exchange at tissue level `to` Gas transport by blood `to` Cellular respiration .
B. Breathing `to` Gaseous exchange at lungs `to` Gas transport by blood `to` Gaseous exchange at tissue level `to` Cellular respiration .

A

1,2,3,4

B

3,1,2,4

C

4,2,1,3

D

4,3,1,2

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