A necropsy (post-mortem analysis) of a marine sea star that died after it was mistakenly placed in fresh water would likely show that it died because

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Sea stars are osmoconformers, meaning they allow the concentration of their body fluids to be the same as their environment. When placed in a freshwater environment, the sea star would become hyperosmotic, causing water to move out of its body, leading to dehydration and death. The necropsy would likely show signs of dehydration and an inability to osmoregulate.

A Necropsy (Post-Mortem Analysis) of a Marine Sea Star That