Multi-cellular organisms require more complex methods of reproduction because their carefully organized structures, such as tissues and organs, cannot be efficiently divided cell-by-cell. More intricate processes are needed to ensure the maintenance of the organism’s overall structure and function during ...

Tissues and organs contribute to the complexity of reproduction in multi-cellular organisms by requiring more sophisticated methods than simple cell-by-cell division. These structures need to be maintained in specific arrangements during reproduction.

The level of organization in multi-cellular organisms involves specialized cells forming tissues, and tissues organizing into organs, creating a structured and non-random arrangement.

Simple cell-by-cell division is impractical for many multi-cellular organisms due to their higher level of organization. These organisms have specialized cells organized into tissues, which are further organized into organs.

Spirogyra achieves reproduction by breaking up into smaller pieces upon maturation, and these fragments grow into new individuals.