Final answer:
The story of the ugly duckling is a fictional tale and does not reflect biological reality.
Step-by-step explanation:
In biology, the transformation of an ugly duckling into a swan is not possible. The story of the ugly duckling is a fictional tale written by Hans Christian Andersen, and it is not based on actual biological processes. Swans and ducks are different species with distinct physical characteristics, and they do not undergo such transformations.