Answers

2016-02-26T06:50:11+05:30
1.Notochord is present in all chordates during sometime of development, it is formed on the dorsal side of the primitive gut in the early embryo stage.
2.
Brain is set inside a bony box, known as cranium.
3.
All vertebrates have a heart and closed circulatory system.
4.
The endoskeleton is made of cartilage or bone.
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2016-02-26T12:10:36+05:30
they have a true vertebral column and internal skeleton bilaterally symmetrical triploblastic coelomic and segmented with Complex differentiation of body tissue they have notochord ,dorsal nerve cord, triploblastic , paired gilled pouches, and coelomate
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