 
 <prompt> Annelids wey get metanephridia wey dey do only di second filtration get wetin inside? Given di last question, write one context wey get di answer. E fit be 1 - 20 sentences. Context: <response>: Annelids wey get blood vessels dey use metanephridia to commot soluble waste products, while those wey no get dey use protonephridia. Both of these systems dey use two-stage filtration process, where fluid and waste products dey first comot and dem go filter am again to re-absorb any re-usable materials while dem go throw away toxic and spent materials as urine. The difference na say protonephridia dey combine both filtration stages for the same organ, while metanephridia dey perform only the second filtration and dey depend on other mechanisms for the first - for annelids special filter cells for the walls of the blood vessels dey allow fluids and other small molecules to pass enter the coelomic fluid, where e dey circulate go the metanephridia. For annelids the points wey fluid dey enter the protonephridia or metanephridia dey for the front side of a septum while the second-stage filter and the nephridiopore (exit opening for the body wall) dey for the segment wey dey follow. As e be so, the hindmost segment (before the growth zone and pygidium) no get structure wey dey commot im waste, as e no get segment wey dey follow wey go filter and throway dem, while the first segment get extraction structure wey dey pass waste go the second, but e no get the structures wey go re-filter and throway urine. 