In Ctenophora,the body bears $....$ external rows of ciliated comb plates,which help in locomotion.

Which type of digestion occurs in Ctenophora?

Identify the phylum which shows the following characteristics:
$1$. Animals are exclusively marine,radially symmetrical,and diploblastic.
$2$. Body bears eight external rows of ciliated comb plates which help in locomotion.
$3$. Digestion is both extracellular and intracellular.
$4$. Reproduction is only by sexual means.

Bioluminescence is a characteristic of which phylum?

Bioluminescence is well-marked in which of the following phyla?

Identify the given organism.