Young fish less than 2 mm long obtain oxygen via diffusion across their body surface, which is efficient due to a short diffusion pathway and a large surface area to volume ratio.
Young fish less than 2 mm long obtain oxygen via diffusion across their body surface, which is efficient due to a short diffusion pathway and a large surface area to volume ratio.
| Front | When first hatched, the young of some species of fish are less than 2 mm long. Explain how these young fish get enough oxygen to their cells without having gills. |
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| Back | exchange/diffusion across body surface/skin; short diffusion pathway/distance/large SA:V ratio; |
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