Distinguish between Nonchordata and Chordata.
|1. Notochord is absent in them||1. Notochord is present in them at some of their developmental stage.|
|2. Their central nervous system is solid and ventral||2. Their central nervous system is hollow and dorsal.|
|3. Heart, if present in them, is dorsal in position.||3. Heart is always present and it is ventral in position.|
|4. Their circulatory system is of open or closed type.||4. Their circulatory system is of closed type.|
|5. Respiratory pigment, the haemoglobin, if present, is dissolved in plasma of blood.||5. Haemoglobin is present in their red blood cells or corpuscles.|
|6. Pharyngeal gill slits are absent in them.||6. Pharyngeal gill-slits are present in them.|
|7. They contain anus at posterior end of body, so post-anal tail is not present.||7. Their anus is not located at posterior tip of body, so contain a post-anal tail.|
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