Biology
Which of the following organisms fix nitrogen in aquatic ecosystems

Cyanobacteria
Chemoautotrophs
Fungi
Phytoplankton

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

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

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