There are 5 carbon atoms present in one molecule of ribulose bisphosphate (RuBP).
Answer: 5 CARBON ATOMS
The formula for RuBP is C5H12O11P2 which means there are 5 carbons atoms , 12 hydrogen atoms, 11 oxygen atoms and 2 phosphorus atoms.
C.) The pressure of the air above the substance. Hope this helps you!