"What three characteristics do proboscis worms have that are not found in other "flatworms"?", "alimentary canal, closed circulatory system, and fluid sac" "Why is their phylogenetic position being debated?", "fluid sac that some suggest is an early coelom" "Where are they found?", "Tropics and subtropics" "What habitats are they found in?", "Ocean" "What phylum is it under and what is another name for these organisms?", "Phylum: Nemertea<br /> called proboscis worm"
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