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Salt cannot bring a fly back to life, it kills slugs because salt absorbs the water and dries them up. Salt cannot bring a fly back to life. It can revive it from a sleep which naturally occurs when the fly is faced with overwhelming pain though. Salt has certain properties which makes it draw moisture from things around it. As a slug has a very high percentage of water in its body, it is easy for salt to draw the water from the slug, causing its osmolarity rate to slow and it will become severly dehydrated and shrivel up, a waterless shell.

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16y ago
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Q: Why is it that salt can kill slugs when sprinkled on them but will make alive a dead fly when sprinkled upon one?
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