Final answer:
Effective longevity at all levels is a biological concept that pertains to the lifespan and ability of organisms to maintain their biological functions over time.
Step-by-step explanation:
Effective longevity at all levels is a concept related to the growth, reproduction, and maintenance of living systems. In biology, longevity refers to the lifespan of an organism, while effectiveness encompasses the ability of an organism to maintain its biological functions and survive over an extended period of time. This concept is relevant at all levels of biological organization, from individual cells to ecosystems. For example, in cellular level, effective longevity involves mechanisms such as DNA repair and maintenance of homeostasis. In terms of ecosystems, effective longevity can be seen in the stability and resilience of diverse species and ecological processes.