What does a sandworm (Nereis) possess for locomotion?

Animals with metameric segmentation, bilateral symmetry, and a closed circulatory system belong to which phylum?

Which option shows the maximum number of correct characteristics for the given figure?

$A$ definite number of body segments is found in

Assertion $A$: Annelids exhibit extracellular digestion.
Reason $R$: The digestive tract in annelids is complete.
Which option is correct for Assertion $A$ and Reason $R$?

$A$ student was given a specimen to identify on the basis of the characteristics given below.
$(i)$ They are metamerically segmented.
$(ii)$ Presence of closed circulatory system.
$(iii)$ They have circular and longitudinal muscles for locomotion.
Identify the specimen.