The oral hood of cephalochordate animals has narrow thread-like structures called oral cirri. Oral cirri hang around the mouth. It is a sensory organ. It acts as a filter. Such as Branchiostoma
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The oral hood of cephalochordate animals has narrow thread-like structures called oral cirri. Oral cirri hang around the mouth. It is a sensory organ. It acts as a filter. Such as Branchiostoma