The body tolerates a wide range of many variables such as blood glucose and sodium plasma levels. Why do you think that is there much less variation tolerated in oxygen saturation? Normal ranges:
Glucose 90-130 mg/dL
Plasma-sodium 135 and 145 (mEq/L)
Oxygen 95-100% saturation
There is much less variation tolerated in oxygen saturation because

I do not know and also you are from bryant Hs Right?

Explanation:

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter