Iodine is an important micronutrient involved in thyroxine production. Without adequate iodine present in the diet, a thyroid dysfunction called a goitre may occur. a) Iodine is necessary for the synthesis of thyroxine. In your own words, hypothesize about how an excess of iodine in the diet may or may not affect people.  b) A hypothesis can be accepted or rejected through research. With respect to the thyroxine feedback loop, provide one scientifically valid explanation that supports or refutes your hypothesis.

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