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(i)Counter-current flow system
(ii)Increases the concentration gradient for gaseous exchange
(iii)Kindney
isaacmuthini answered the question on November 16, 2017 at 07:01
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Reasons …………………………………………………………..
Sub-division………………………………………………………
Reason………………………………………………………………
Class……………………………………………………………………
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