📝 Multiple Choice Question
General-science
Which group of animals has a segmented spinal column together with a few primitive forms in which the backbone is represented by a notochord?
A
Arthropoda
B
Echinodermata
C
Mollusca
D
Vertebrata
Explanation
The biological subphylum Vertebrata is fundamentally defined by the physical presence of a robust, segmented protective spinal column (or a basic notochord in highly basal forms).
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