The external gills of newt tadpoles absorb oxygen from water using fine filaments with a large collective surface area.

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"The large surface area of fine filaments is used by the external gills of the newt tadpole…to absorb oxygen from the surrounding water." (Foy and Oxford Scientific Films 1982:25)

Book
The grand design: Form and colour in animalsBLA Publishing Limited for J.M.Dent & Sons Ltd, Aldine House, LondonSeptember 18, 1983
Sally Foy

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