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B
It is related to ecdysis.
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C
It is related to reverse metamorphosis.
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D
It is related to apolysis.
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Solution
The correct option is A It is related to neoteny and paedogenesis. Ambystoma exhibits neoteny and paedogenesis. Its larva fails to undergo metamorphosis, retain three pairs of external gills but become sexually mature. Such sexually mature larvae are called as axolotl. Retention of larval characters is called as neoteny and this type of reproduction is called as paedogenesis.