Water does end up going into freshwater fish’s mouths, but instead of swallowing it, the water is filtered out through the ...
As seawater creeps further into coastlines, salt threatens to pollute the freshwater reserves that people depend on. But this ...
Natural freshwater pearls occur in mussels for the same reason that saltwater pearls occur in oysters. Foreign material, usually a sharp object or parasite, enters a mussel and cannot be expelled.
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