Which type of digestion occurs in Ctenophora?

The ciliated comb plates in $Pleurobrachia$ are meant for

Describe the phylum which shows bioluminescence.

Identify the given organism.

Why is $Ctenophora$ considered a minor phylum?

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.