| Feature | Terrestrial Respiration | Aquatic Respiration |
|---|---|---|
| $1$. Organ of respiration | Usually occurs through lungs or skin. | Usually occurs through gills. |
| $2$. Oxygen availability | Air contains a higher concentration of dissolved oxygen. | Water contains a lower concentration of dissolved oxygen. |
| $3$. Energy expenditure | Organisms spend less energy to obtain oxygen. | Organisms must breathe faster and spend more energy to obtain sufficient oxygen. |
| $4$. Habitat | Occurs in organisms living on land. | Occurs in organisms living in water. |
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