Bilaterally symetrical and triploblastic ( 3 fundamental cell layers). Have no body cavity other than the gut and lack an anus. The same pharyngeal opening both takes in food and expel waste.
Breathe by diffusion and have complex life cylces.
Terrestrial faltworm are parasitic while marine flatworms (some 4500 species) are free living.
These were the first Hunters of the Ancient World
...........................................................
Clip 2: Watch How Flatworms Mate
.jpg)
