Final answer:
The average lifespan of a cloned lifeform (CL), such as Dolly the sheep, depends on the species and can be influenced by cloning-related health issues. For cells in culture, 'CL' may refer to 'culture lifespan', which is limited by factors like the Hayflick limit.
Step-by-step explanation:
If by 'CL' you are referring to the average lifespan of a cloned lifeform, it can vary widely depending on the species that is cloned. For instance, Dolly the sheep, the first mammal cloned from an adult somatic cell, lived for 6 years, which is approximately half the average lifespan of a sheep. However, the lifespan of cloned animals can be similar to that of non-cloned animals if no complications arise. It's important to note that cloning can involve a higher risk of anomalies and health issues, which may influence the lifespan of cloned animals. In the case of cellular lifespan, 'CL' may refer to 'culture lifespan' or how long cells can divide in culture, which is also dependent on the cell type. For human fibroblasts in culture, this may be around 50 divisions before reaching the Hayflick limit, a point at which cells no longer divide.