(b) What are the two salient features of reading?
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The characters which are present either in the embryonic or adult stage od chordates are
1) Notochord: There is a notochord which is present in the embryonic stage. It is made up of cartilage.
2) Dorsal hollow nerve cord: There is a bundle of nervous fibres which are present in the dorsal region and run down the body.
3) Pharyngeal gill slits: These are series of openings which are used as gills.
4) Tail: They have a post-anal tail near the anal opening.
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