1.

Notochord, Dorsal nerve chord and Gill-slits are features seen in : (a) vertebrata (b) protozoa (c) mollusca (d) porifera

Answer»

(a) The defining characteristic of a vertebrate is considered the backbone or spinal cord, a brain case, and an internal skeleton, but the latter do not hold true for lampreys, and the former is arguably present in some other chordates.



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