why bood is red???????

India
February 2, 2007 5:49am CST
why other animals have different colors of blood but humans have red one?
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1 response
Bee1955
@Bee1955 (3882)
• United States
2 Feb 07
We actually have blue-greenish blood in our veins (look at them on your skin sometime, and see they are blue thru it). However, when air hits them (as in a sore or cut), it oxidizes the blood causing it to turn to red. A simple bio-chemistry effect.