There are 20,000 known species
There are three classes in the platyhelminthes phylum. These classes include Turbellaria, Monogenea, and Trematoda. These classes still break down into orders, families, genus, and species. I'm still...
Coniferous, Alpine, Irrigated, River rain/Bela, Mangrove, Tropical Thorn and Sub Tropical Scrub .. hope that answers your question :)
No, Platyhelminthes lacks a circulatory system and a respiratory system.
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