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Write one feature which is common to each of the following (a)chlorophyll & haemoglobin (b)arteries & veins

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One feature which is common to 

1. Hemoglobin and Chlorophyll is they both have a porphyrin structure that binds with a central metal ion to form a complex which is essential to its metabolic activity. 

2. Arteries and veins are the types of special conducting cells called blood vessels. They transport blood between heart and body tissues

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Ritika Jonwal

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