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

1. Arthropoda - Body divided into head, thorax and abdomen and respiration by tracheae
2. Chordata - Notochord at some stage and separate anal and urinary openings to the outside
3. Echinodermata - Pentamerous radial symmetry and mostly internal fertilization
4. Mollusca - Normally oviparous and development through a trochophore or veliger larva

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

Solution

Arthropods commonly have a body divided into head, thorax, and abdomen, and many terrestrial forms respire through tracheae. The other options each contain at least one incorrect characteristic for that phylum.

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