Given is the structure of a blue gree al...

Given is the structure of a blue gree alga. Identify the function of the marked region A and B.

A

`{:(A,B),("oxygenation ","protection"):}`

B

`{:(A,B),("Nitrogen fixation ","Respiration "):}`

C

`{:(A,B),("Nitrogen fixation ","Retention of moisture "):}`

D

`{:(A,B),("Nitrogen Protection ","Nitrogen fixation"):}`

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The correct Answer is:

C

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