Identify the characteristic feature marked as 1,2, 3 and 4 in the given figure. (a) 1-Notochord;...

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Identify the characteristic feature marked as 1,2, 3 and 4 in the given figure.
(a) 1-Notochord; 2-Post-anal part; 3-Gill slits; 4-Nerve cord
(b) 1-Nerve cord; 2-Notochord; 3-Post-anal part; 4-Gill slits
(c) 1-Notochord; 2-Nerve cord; 3-Gill slits; 4-Post-anal part
(d) 1-Gill slits; 2-Post-anal part; 3-Nerve cord; 4-Notochord
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