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

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

Solution & Step-by-step Explanation

Molluscs are typically oviparous and their indirect development often involves a trochophore or veliger larval stage.Arthropods don't all have tracheae (e.g., crustaceans use gills).Echinoderms mostly show external fertilization.

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Which one of the following phyla is correctly matched with its two general characteristics?
A
Mollusca — Normally oviparous and development through a trochophore or veliger larva
B
Arthropoda — Body divided into head, thorax and abdomen and respiration by tracheae
C
Chordata — Notochord at some stage and separate anal and urinary openings to the outside
D
Echinodermata — Pentamerous radial symmetry and mostly internal fertilization

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