(c) Environmental factors affect metamorphosis in several
ways. Abundence of food, cold temperature or insufficient
iodine (component of thyroxin hormone) may cause
failure of metamorphosis and retention of larval features.
Calcium, magnesium, phosphorus are not found to play
any role in metamorphosis in animals. Larva of
Ambystoma is known as axolotl. It is found in USA
(North America) and Maxico. It show neoteny or