The cell membrane allows substances to enter and leave the cell and gives the cell structure.
The warmth and redness of the surrounding area of the cut is due to the immune system.
Blood carries white blood cells, which attacks pathogens (Cause of infection)
The surface become red and warm as that is a conjugating area of blood.
I believe the answer is B. Carbon is NOT a macronutrient since <span>Nutrients are classified as macronutrients and micronutrients. </span>
