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The purpose of excretion is to keep a constant level
of salts and water in the haemolymph, or blood of the butterfly, and to get rid of toxic compounds that are produced during
metabolism. Adult monarchs do this using a system of tubes called Malpighian tubules, which are found throughout the body.
These tubules pick up materials from the haemolymph, and then carry them to the rectum of the butterfly. All of the materials
that the butterfly doesn't need, or would be harmful to it, are then concentrated in a liquid form.
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