Carbon fixation occurs when co2 combines with:
a. rubisco
b. g3p
c. rubp
d. glucose phosphate

The correct answer will be option-C.

Explanation:

Carbon fixation is a step of the light-independent reaction called the Calvin cycle of the photosynthesis.  The Calvin cycle proceeds in three steps: carboxylation, reduction and regeneration of RuBP.

During carboxylation, the carbon from carbon dioxide binds the RuBP molecule, a five-carbon molecule by Rubisco enzyme and form two molecules of 3-phosphoglycerate (3PGA).

Thus, Option-C is the correct answer.

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high