Yes, as scientists could figure out what might have changed in the variables she used. Brainliest me and I can give you the whole system.
I think b. Proteins are polymers of amino acids is the correct answer
It will cause vasodilation of blood vessels in the brain.
CO2 is one of the metabolic end products that can alter the
tone of the blood vessels in the brain. High CO2 levels cause vasodilation,
which may cause headache, whereas low CO2 levels cause vasoconstriction, which
may cause lightheadedness. The statements included in the other options are
incorrect effects.
