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B
Saccoglossus
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C
Herdmania
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D
Branchiostoma
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Solution
The correct option is ABalanoglossus
Balanoglossus is also called an acorn worm. They belong to the phylum Hemichordata and reside in the ocean.
These feed on small microbes and organic matter in the ocean. Starvation leads to a decreased nutrient supply and hence can lower the size of the acorn worm.