Which chordate structures are lost when the larval tunicate developes into the adult form ?

A tunicate tadpole larva contains several chordate features, such as the notochord, dorsal nerve cord, and tail. These features are lost, however, as the larva metamorphoses into the adult form. The tunicate larva has special organs of sense and attachment, which it uses to find and occupy a suitable habitat

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i'd have to say the answer is probable the second option "the geosphere interacting with the atmosphere"

i guess because there isn't enough love going around. < 3