I don’t think you’re looking for a part but I believe you’re looking for blood, more specifically the red blood cells
I believe the answer is B.
Explanation:
Well if I do believe as time continues on and I mess everything up. As every fact in history of the brain tells me. As everyone who is 21 and above while being able to understand this or not. As life explains whispering in your ear. As everyone tells you in a paragraph full of evidence and I say to waste your's and my time:
Because it's illegal and destroys your brain, have a good day.
39.5 million deaths out of 56.4 million global deaths (around 70%) are from noncommunicable diseases.