If insects breathe through their body, then in water they should instantly drown? Like human lungs full of water.
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Yes, except for their hairs keeping a film of air around them thanks through surface tension of the water. It will take a long while until the insect depleted the oxygen in this bubble.
Air molecules are smaller than water molecules or drops of water. In theory, the water would not enter their breathing holes, and some bugs have a slick or oily outer layer that would repel water, or hairs to push the water away
Bugs are water repellant and the surface tension of the water means that the holes are too small for water to seep in naturally.
Fun fact if you want a really effective insect killing spray you can use WD40. It’s a penetrating oil meaning it will seep into even those small holes in their body and kill the insect pretty much instantly.
Warning: WD40 is poisonous and I wouldn’t recommend breathing in any of it or spraying it where kids and pets can get at.
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