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Red and white blood cells.
The red stand for blood.
All of them. White blood cells attack disease and the red carry blood and oxygen to the wound. Red blood cells also repair the body.
Us humans. We have blue blood, when blood hits oxygen, it turns red.
Humans have red hearts because we have red blood. Squids have white hearts because their blood is white.
By sucking the blood of infant humans.
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Inside the veins and arteries
well in twilight they don't have blood, but in the Darren Shan books they have red blood like humans
Both red and white blood cells
Well, I'm guessing humans since our red blood cells don't have any nuclei
a dolphins blood is somewhat like humans but their blood starts out red and come out red