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A fly can't hold its breath at all

It doesn't have lungs and can't control the entry and exit of air into its body, which happens by way of a series of holes (called 'spiracles') on the sides of its body leading to a series of branching tubes taking air into its body. Gaseous exchange takes place by diffusion alone (although some insects can contract and relax their muscles to force air in and out)

If you place an insect under water, air often gets trapped around its body due the nature of its 'skin' (actually called its exoskeleton) and the surface tension of the water - and air also remains in the tubes. It will take a considerable time for this air to be used up (maybe 5+ minutes).

If you add something like washing detergent to the water, this will break the surface tension of the water so that there will be little or no air trapped around the fly's body. This would give a much more accurate indication of how long it can survive without air. respond below :)

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13y ago

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