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GCSE
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More cards in this set
Card 6
Front
Considered as the most primitive gills and "penne"-shaped, they are...
Back
Card 7
Front
External gills mostly found within (clade)...
Back
Card 8
Front
Musclous axis composed of thin membranes...
Back
Card 9
Front
From which layer external gills originates ?
Back
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