The organism show a free- living one that is anchored to the bottom of ponds and streams during the first part it is life cycle. what is the common name of a group to which this organism belongs?  HELP PLZ ASAP 

A.Comb jellies

B. arthropods

C. cnidarians

D. echinoderms

The organism show a free living one that is anchored to the bottom of ponds and streams during the first part it is life cycle what is the common name of a grou class=