Question
Write any four differences between chordates and non-chordates.
| | Chordates | Non-chordates |
| 1. | They possess a notochord at some stage in life. | They do not possess a notochord. |
| 2. | Pharynx is perforated by gill slits. | Gill slits are absent. |
| 3. | Heart is ventral. | Heart (if present) is dorsal. |
| 4. | Single, hollow tubular nerve cord is dorsal. | Nerve cord is solid tubular, single/ double and ventral. |
| 5. | A post anal tail is present. | A post-anal tail is absent. |
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