Question 5
What is the easiest characteristic for telling annelids from molluscs?
The right answer is the one marked above.
An annelid body is segmented and a mollusc body is not. Both are triploblastic, bilaterally symmetrical and soft-bodied.
It is molluscs that have shells, not annelids — so “annelids have shells and molluscs do not” has it the wrong way round.