Which of the following characters are common to both Annelida and Chordata?a) coelomb) bilateral symmetry c) pharyngeal gill-slits d) organ system level e) metamerism  f) post-anal tail

Coelom, organ system level of organisation, bilateral symmetry and metamerism are the characters shared both by annelids and chordates.Post-anal tail and pharyngeal gill-slits are found only in chordates (not in non-chordates like annelids).