| Thyroxine controls ____ in frogs and the development of ___ during embryonic development of other vertebrates. Thyroxine production requires the presence of ____ in diet. |
| Select the correct sequence of words to complete the above passage. |
A) Development, Circulatory system, Iodine
B) Metamorphosis, Circulatory system, Calcium
C) Development, Nervous system, Iron
D) Metamorphosis, Nervous system, Iodine
Correct Answer: D
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