Fill in the table “Comparative characteristics of worms”

Signs Flat worms Round worms Annelids
Organs of movement No No Bristles or parapodia
Muscle types Transverse, longitudinal and diagonal Longitudinal muscles Annular and longitudinal
Body cavity Absent, filled with parenchymal cells Primary Secondary, segmented
Cuticle No The cuticle is thick The cuticle is thin
Digestive system Closed Through with anus End-to-end, complicated
Respiratory system Skin respiration Skin respiration Dermal, may have gills
Circulatory system No No Closed circulatory system
Nervous system Stem ladder Stem ladder Stem, periopharyngeal nerve ring, abdominal nerve chain
Reproductive system Hermaphrodites Divided Divided and hermaphrodites
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