Answer:
Tadpoles start off having gills like a fish but the older they get there gills start to disappear they breathe like fish because they do have gills as younglings.
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Explanation:
Chemical breakdown is affected by it I just did in zymes treated by the track and accessory organs as well as hydrochloric acid secreted by the stomach the G.I. tract is protected from the corrosive actions of these enzymes and acid by a mucous membrane composed of epithelial cells which secrete mucus and fluid
