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(a) In which group of animals would you ...

(a) In which group of animals would you find Aristotle's lantern ? What is its function ?
(b) Which animal is considered to be a symbol of 'unio till death ' and is presented as a costly married gift in Japan as dried and cleaned skeleton?

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(a) Echinoidea (Phylum Echinodermata ) . Aristotle's lantern is a characteristic biting an dchewing toothed apparatus in this group of organisms .
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