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Just like you and me, fish can tolerate different levels of stuff in our air or water. For example, some people can tolerate a high level of pollens in the air, and some people get sick easily when there are pollens in the air.Think of the people who can't tolerate pollens in the air as Freshwater Fish and the ones that can as Saltwater Fish. A lot of it has to do with your environment and genes, and a starfishes environment is in the sea, so they have adapted through evolution to the saltwater in their environment.

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14y ago

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