Biology
Of the following taxonomic categories which is the most inclusive (i.e. is the highest in hierarchy)?

Subspecies
Genus
Order
Class

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

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
Haemoglobin of RBC can carry both oxygen and carbon dioxide

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