21. Fishes & Mollusks

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1.
Which among the following fishes does not have Central Nervous System?
2.
Which among following is not a Fish?
3.
Zebrafish, which has been genetically modified in Glofish to be sold as a pet is native to which among the following countries?
4.
Which among the following is a Mollusc?
5.
Biologists have been able to demonstrate the hearing and sound sensory mechanism through the acoustico-lateralis system in which of the following vertebrates ?
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