Which one of the following is a living fossil | vedclass

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(A) living fossil is an extant taxon that closely resembles related species known only from the fossil record. $Sphenodon$ (the tuatara) is a reptile

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Sphenodon

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(A) living fossil is an extant taxon that closely resembles related species known only from the fossil record. $Sphenodon$ (the tuatara) is a reptile found in New Zealand that has remained virtually unchanged for millions of years,making it a classic example of a living fossil. $Heloderma$ is a genus of venomous lizards,while rabbits and frogs are modern,highly evolved organisms that do not fit the definition of a living fossil.

$(a)$ Ophiura	$(i)$ Mollusca
$(b)$ Physalia	$(ii)$ Platyhelminthes
$(c)$ Pinctada	$(iii)$ Echinodermata
$(d)$ Planaria	$(iv)$ Coelenterata

Which one of the following is a living fossil?

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$(a)$ Ophiura $(i)$ Mollusca
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