exchange 0.0 / 5 ? Biologyexchange surfacesA2/A-levelAQA Created by: Ems9Created on: 27-02-18 11:39 gills adaptation for gas exchange in water, can be internal or external. as water flows through it supports them and stops them collapsing 1 of 5 lungs + tracheae adaptation for gas exchange in air 2 of 5 internal gills protected and adapted later 3 of 5 external gills adapted first, vulnerable to predators and infection 4 of 5 insects spiracles-open to the outside 5 of 5
Exchanges with the external environment of both cells and organisms to maintain their internal environment 0.0 / 5
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