Question

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Answer 1

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Ventral nerve cord is common feature in these organisms.

$\huge \underline \bold{explanation - }$

➡️Leeches belong to phylum annelids where as cockroaches and scorpion  belongs to phylum arthropods.

➡️But there is a common feature in these organisms is they have Ventral nerve cord. This ventral nerve cord is a part of central nervous system. Along with above mentioned phyla ventral nerve cord is also seen in nematoads.