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Animal Biology
The latest stories, clear explanations and essential discoveries from Animal Biology.
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How Do Fish Breathe Underwater?
Most fish breathe by moving water across gills. Oxygen dissolved in water diffuses through thin gill surfaces into blood, while carbon dioxide diffuses out. In many bony fish, blood moves opposite to the water,…
Oct 4, 2026 • 13 min readRead the discovery →LATEST
Latest discoveries
New stories, explanations and research from Animal Biology.