Which of the following methods allows a sponge to regrow from a cut section?

Regeneration is the process that enables a sponge to regrow from a cut section. Sponges have a remarkable ability to regenerate lost tissues or whole organisms from fragments, thanks to their unique cellular structure and the capability of their cells to dedifferentiate and then redifferentiate into various cell types. When a sponge is cut, the remaining cells can re-organize and form new tissues, eventually leading to the regeneration of the entire organism.

This ability is particularly evident in sponges because they lack true tissues and have a simple body plan, making it easier for the individual cells to migrate and reform structures. As a result, when parts of a sponge are separated from the main body, those fragments can each develop into a new, complete sponge over time.

While other methods listed may involve asexual reproduction or other forms of growth, such as budding or gemmule production, they do not specifically pertain to the regeneration of a sponge from a cut section like regeneration does. Budding involves producing an outgrowth from the parent sponge, while gemmules are structures formed for survival in adverse conditions, and fission refers to a type of division into two separate entities.