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Spiders have _____ to absorb salts and wastes while humans have microscopic subunits in the kidneys called _____ to filter blood.Spiders have malpighian tubules to absord salts and wastes while humans have microscopic subunits in the kidneys called nephrons to filter blood.

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Spiders have malpighian tubules to absorb salts and wastes while humans have microscopic subunits in the kidneys called nephrons to filter blood. Malpighian tubules remove wastes from insects by producing urine and solid nitrogenous waste, which are then excreted from the body.
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