Which of these is not characteristic of chordates?
a dorsal supporting rod
a dorsal hollow nerve cord
pharyngeal pouches
chloroplasts in their cells

The option which is not a characteristic of chordates is chloroplasts in their cells.
Chordates do have a dorsal supporting rod (vertebrates are types of chordates - they have a spine), a dorsal hollow nerve cord (within the spine), and pharyngeal pouches. However, they do not have chloroplasts, because that is a characteristic of photoautothropic eukaryotes, which chordates certainly are not.

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