Identify the organism and the phylum it belongs to-
A
Holothuria: Porifera
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B
Echinus: Echinodermata
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C
Balanoglossus: Protochordata
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D
Unio: Mollusca
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Solution
The correct option is C Balanoglossus: Protochordata The given organism is Balanoglossus. It belongs to the phylum Protochordata. They are bilaterally symmetrical and possess notochord at some stages of their lives. These animals are exclusively marine.