Fewpal
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A) Echinodermata: Pentamerous radial symmetry & mostly internal fertilization

B) Mollusca: Normally oviparous & development through a trochophore or veliger

C) Arthropoda: Body divided into head, thorax & abdomen & respiration by tracheae

D) Chordata: Notochord at some stage & separate anal & urinal openings to outside.

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Correct answer:
(c) Arthropoda-Body divided into head, thorax and abdomen and respiration by tracheae

Arthropoda is the largest phylum of animal kingdom. Body of arthropod is divisible into head,thorax and abdomen. Head and thorax often fused to form cephalothorax. The respiration takes place by general body surface,gills,tracheae or book lungs. Mollusks are dioecious or monoecious,one or more gonads with gonoducts,opening into renal ducts or to exterior. The fertilization is external or internal,development direct or through free larval forms. Echinoderms have a pentamerous radial symmetry derived from an original bilateral symmetry. The fertilization is external,development indirect through free-swimming larval forms. Chordates are sharphy distinguished from non-chordates by presence of notochord,dorsal tubular central nervous system and pharyngeal gills slits.

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Why not the chordates too?
by (25.4k points)
In chordates, four common features appear at some point during development: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.
a notochord
a dorsal hollow nerve cord
pharyngeal slits
post-anal tail

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