Can someone explain how C Is correct this diagram.. Like how is bicarbonate low?

Let's see what makes the amount of Bi-carbonate ion low in X!

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The question is a bit tricky so read the below points carefully.

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This is what happens inside the Red blood cells:-

Reaction :

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Thus the PCO2 is high though the amount of Bi-carbonate ion is low in X!

b) the inside picture would look at a very high temperature in a very low ph

geologic time scale (for gradpoint) =)