Which phylum does not show radial symmetry?

Animals of this phylum excrete through nephridia.

In which of the following phyla did a true coelom first evolve?

$A$ 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.

In the animal kingdom,the first time appearance of a true coelom is present in:

Which of the following is an example of the class $Polychaeta$?