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Which one of the following statements is incorrect ?

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In arthropods, respiratory structures include only book-gills and gills.

In ctenophores, comb plates help in locomotion.

Fasciola has a complex life cycle with several stages.

Earthworms are hermaphrodite and yet cross fertilisation occurs in them.

answer is A.

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Detailed Solution

Respiratory organs in arthropods include gills, book-gills, book lungs or tracheae.

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