I just read that the bull shark is considered the most dangerous shark to humans. They are aggressive and can live in both saltwater and freshwater and have been found miles up various rivers and lakes. Humans don’t expect sharks to be in the river so it takes longer to realize that there is an active shark roaming the rivers.
How can a bull shark survive in both saltwater and freshwater?
In: Biology
Basically, they crank up activity of certain genes in the gills and kidneys that help the cells there hang on to or absorb salt ions
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