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Write one feature which is common to each of the following and write their function

(a)chlorophyll & haemoglobin
(b)arteries & veins


One feature that is common in chlorophyll and haemoglobin is that they both are pigments.
One feature that is common in arteries and veins is that they both are blood vessels.
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(a) Both have same elements: carbon, oxygen, hydrogen ad nitrogen.
      Have similair structures.
(b) Both carry blood.
     Both have elastic fibres which allow them to stretch and recoil.
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