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Originally Posted by Jimbuna
A spider has transparent blood.
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Not trying to be a smart@ss here, but according to Wikipedia (So it must be correct!):
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Spiders, like most arthropods, have an open circulatory system, i.e., they do not have true blood, or veins which transport it. Rather, their bodies are filled with haemolymph, which is pumped through arteries by a heart into spaces called sinuses surrounding their internal organs. The haemolymph contains hemocyanin, a respiratory protein similar in function to hemoglobin. Hemocyanin contains two copper atoms, tinting the haemolymph with a faint blue colour.
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Its just that a lot of these "facts" that are repeated all the time are not exactly factual.
60% of all facts are wrong 90% of the time!