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B
Pheretima
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C
Ascaris
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D
Periplaneta
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Solution
The correct option is A
Limulus
A living fossil is a living organism that belongs to an otherwise extinct group. In other words, a living fossil is the only living member of its respective taxon (while the other members of the taxon are extinct). Limulus (horseshoe crab) is an example of a living fossil.