The correct answer is D. Oxygenated and deoxygenated blood would mix in the heart.
When that happens, an issue called Methemoglobinemia rises, which means that your blood carries less oxygen and often you can even die because of that.
Homeostasis. Hope I helped
I am pretty sure that the answer is equilibrium. I know it is a correct statement, but it may not be the statement you were looking for. Hope I helped :)
Answer:
I believe it is the 3rd one ( bottom one)