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(A) The evolution of the nervous system follows the complexity of animal body organization:$1$. $Porifera$ (sponges) are the most primitive multicellu

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$(d)$,$(b)$,$(c)$ and $(a)$

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(A) The evolution of the nervous system follows the complexity of animal body organization:$1$. $Porifera$ (sponges) are the most primitive multicellular animals and lack a nervous system $(d)$.$2$. $Cnidaria$ (e.g.,$Hydra$) show the first appearance of a diffused nervous system $(b)$.$3$. Further evolution led to the formation of ganglia,which are clusters of nerve cell bodies $(c)$.$4$. Finally,higher invertebrates and vertebrates developed a centralized nervous system $(a)$.Therefore,the correct sequence is $(d), (b), (c), (a)$.

Arrange the following in the correct sequence in the evolution of the nervous system:
$(a)$ Formation of a centralised nervous system.
$(b)$ Diffused nervous system in $Hydra$.
$(c)$ Formation of a ganglion.
$(d)$ Nervous system is lacking in sponges.

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Arrange the following in the correct sequence in the evolution of the nervous system:$(a)$ Formation of a centralised nervous system.$(b)$ Diffused nervous system in $Hydra$.$(c)$ Formation of a ganglion.$(d)$ Nervous system is lacking in sponges.