Which one of the following phyla is correctly matched with its two general characteristics?

Options

(a) Arthropoda – Body divided into head, thorax and abdomen and respiration by tracheae
(b) Chordata – Notochord at some stage and separate anal and urinary openings to the outside
(c) Echinodermata – Pentamerous radial symmetry and mostly internal fertilization
(d) Mollusca – Normally oviparous and development through a trochophore or veliger larva

Correct Answer:

Mollusca – Normally oviparous and development through a trochophore or veliger larva

Explanation:

Mollusca mostly oviparous and a few viviparous. The development may be direct or indirect with trochophore, velliger and glochidium.