Give reason
Tadpoles need to live in salty water to achieve their transformation into frogs.

The process through which tadpoles turn into frogs takes place only in the presence of the harmone thryroxine. Since the secretion of this harmone requires sufficient amount of iodine , tadpoles need to live in salty water . if the water in which they are present is not salty , they do not mature into frogs .
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