Which one of the following phyla is correctly matched with its two general characteristics?
Correct answer: C. Arthropoda - body divided into head, thorax and abdomen and respiration by tracheae
- A. Echinodermata - pentamerous radial symmetry and mostly internal fertilization
- B. Mollusca - normally oviparous and development through a trochophore or veliger larva
- C. Arthropoda - body divided into head, thorax and abdomen and respiration by tracheae
- D. Chordata - notochord at some stage and separate anal and urinary openings to the outside
Explanation
Arthropods are the largest phylum of Kingdom Animalia that characteristically possesses an outer body layer - the cuticle. Their body is composed of segments usually forming distinct specialized body regions, i.e., head, thorax and abdomen. In them the trachea or windpipe or book lungs are the respiratory organs found in terrestrial forms, which help in respiration.
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