Biology
Which of the following is not a function of saliva?

Moistens food and helps stick it together to make it easier to swallow
Begins the chemical breakdown of starches
Helps clean the mouth
Contains fluoride to harden the tooth enamel

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

Haemoglobin of RBC can carry only carbon dioxide
Haemoglobin of RBC can carry both oxygen and 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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