Segmented Worms
the most complex group of invertebrate is cnidarians
Phylum Vertebrata has the most complex animals.
Because you touch yourself at night
The Segmented worms are forefathers of the most modern complex organisms. The segmentation seen in the earliest worms lead to the ability to join complex systems. So from the lowly fly to the largest whale can trace its development back to the segmented worms of the past.
Group Behavior
A group of worms is called a clew. In fishing terms, they may be referred to as a bait of worms.
Society
Segmented worms
earthworms, polychaete worms, and leeches.
social animals
Group Behavior
Pinworms belong to the Nematode group of worms.