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(C) The correct matching is as follows:$(1)$ Urochordata (Tunicata): In these organisms, the notochord is present only in the larval tail.$(2)$ Cephal

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$(1-d), (2-c), (3-b), (4-a)$

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(C) The correct matching is as follows:$(1)$ Urochordata (Tunicata): In these organisms, the notochord is present only in the larval tail.$(2)$ Cephalochordata: In these organisms, the notochord extends from head to tail region and is persistent throughout their life.$(3)$ Vertebrata: In vertebrates, the notochord is present during the embryonic period and is replaced by a cartilaginous or bony vertebral column in the adult.$(4)$ Chordata: The phylum Chordata is characterized by the presence of a notochord, which is a rod-like structure of mesodermal origin.Therefore, the correct sequence is $(1-d), (2-c), (3-b), (4-a)$.

$(1)$ 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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