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

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

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Biology
Which statement best describes Arteries?

They have thick walls and transport blood toward the heart
They have thin walls and transport blood toward the heart
They have thin walls and transport blood away from the heart
They have thick walls and transport blood away from the heart

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