Blood carried by most arteries as bright red an colour while that carried by
most veins is dark red. Why?

Explanation:

The color of human blood ranges from bright red when oxygenated to a darker red when deoxygenated . It owes its color to hemoglobin, to which oxygen binds.

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consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls