Which one of the following is not the characteristic of the phylum to which Pleurobrachia belongs?
Sexes are not separate. Fertilisation is external with indirect development.
Ctenophores are commonly known as sea walnuts or comb jellies.
Bioluminescence (the property of a living organism to emit light) is well-marked in ctenophores.
The body bears eight external rows of ciliated comb plates, which help in locomotion.