planaria with excretory system protonephridia isolated white background flatworm flame cell |
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| navigate by keyword : anatomy animal biology cell cilia diagram element excretory flame flatworm illustration isolated morphology nephridia nephridium osmoregulation part physiology planaria protonephridia protonephridium schema scheme secretory structure system title tube urinary vector white worm |
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| Planaria with excretory system protonephridia isolated on white background. Flatworm flame cell. Protonephridia of planaria and other flatworm |
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