Biology
Which of the following is true about veins?

Veins carry blood away from the heart, while arteries carry blood to the heart
Veins have valves; arteries do not
Veins are more muscular than arteries
Veins have a smaller diameter lumen than arteries

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Biology
Which one of the following statements regarding haemoglobin is correct?

Haemoglobin of RBC can carry both oxygen and carbon dioxide
Haemoglobin of RBC can carry only carbon dioxide
Haemoglobin present in RBC can carry only oxygen but not carbon dioxide
Haemoglobin is only used for blood clotting and not for carrying gases

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