Gnathostomata is divided into $2$ superclasses. These are:
- AAcrania and Craniata
- BPisces and Tetrapoda
- CAmniota and Bipedal
- DTetrapoda and Gnathostomata
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Which of the following animals has a closed circulatory system?
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$A$ fish differs from a whale in having
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View Solution$A$ schematic representation of a chordate's embryo is shown in the figure. The structures marked $A, B, C$ and $D$ are respectively:
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View SolutionSelect the correct option for the following matches regarding Chordates:
$(1)$ Notochord present only in larval stage. $(a)$ Chordata $(2)$ Notochord present throughout life. $(b)$ Vertebrata $(3)$ Notochord is replaced by vertebral column. $(c)$ Cephalochordata $(4)$ Notochord is mesodermal in origin. $(d)$ Urochordata
| $(1)$ Notochord present only in larval stage. | $(a)$ Chordata |
| $(2)$ Notochord present throughout life. | $(b)$ Vertebrata |
| $(3)$ Notochord is replaced by vertebral column. | $(c)$ Cephalochordata |
| $(4)$ Notochord is mesodermal in origin. | $(d)$ Urochordata |
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