Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?
More complex organisms cannot give rise to new individuals through regeneration because they are not simply a random collection of cells. In these organisms, specialised cells are organised as tissues, and tissues are organised into organs, which have to be placed at definite positions in the body.
In such a carefully organised situation, cell-by-cell division would be impractical. Unlike simple organisms, complex multi-cellular organisms cannot simply divide cell-by-cell to reproduce. Therefore, they need to use more complex ways of reproduction.
Explanation
The answer is derived directly from the textbook section explaining why multi-cellular organisms cannot use regeneration for reproduction. It highlights the structural complexity (tissues and organs) and the impracticality of cell-by-cell division in such organized systems.
Solution Steps
Step 1: Identify that complex organisms have a high level of organization (cells -> tissues -> organs -> body design).
Step 2: Explain that this organization requires specific placement of organs, making simple cell proliferation insufficient.
Step 3: Conclude that cell-by-cell division is impractical for maintaining this complex structure, necessitating other reproductive methods.