Ascaris is considered to be a(n)

A) flatworm.
B) earthworm.
C) roundworm.
D) cnidarian.
E) arthropod.

Ascaris

A genus of parasitic nematode worms which can cause the infection ascariasis in humans through ingestion of eggs from contaminated sources.

Roundworm

Invertebrates with nonsegmented cylindrical body covered by a cuticle that molts; some forms are free-living in water and soil, and many are parasitic.