Question
Write five differences between chordata and nonchordate.
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Chordates
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Non-chordates
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1.
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They have a notochord.
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They never have a notochord.
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2.
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Central nervous system includes a single, dorsal, hollow, nerve cord.
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Central nervous system includes a double, ventral and solid nerve cord.
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3.
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Heart is ventral; haemoglobin is present in erythrocytes (cells).
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Heart is dorsal; haemoglobin is dissolved in the plasma and not in cells.
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4.
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Pharynx is perforated by gill slits.
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Gill slits are absent.
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5.
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A post-anal tail is present at some stage of the life.
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A post-anal tail is absent.
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