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a) Presence of valves at regular intervals
b) - Have biconcave shape to increase surface area for packaging of more haemoglobin hence absorption of gases
-There's absence of nucleus and other organelles to increase packaging of haemoglobin
-There's presence of red pigment haemoglobin that has high affinity for oxygen
johnmulu answered the question on May 3, 2017 at 07:20
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