What is at the center of a red blood cell? A. Copper
B. Iron
C. Plasma
D. Carbon dioxide

D

Explanation:

it gives it to the lungs for you to exhale

Hemoglobin is the protein inside red blood cells. It carries oxygen. Red blood cells also remove carbon dioxide from your body, transporting it to the lungs for you to exhale. Red blood cells are made in the bone marrow.

So your answer my chum would be D

tell their parents and make sure she gets from a counselor or therapist. be supportive and be there for her. be a kind and good friend. spend time with her to make her feel like she's not alone. i'm not a professional but i really hope they stays strong.