Final answer:
Organisms exhibit a good fit with their environment through the process of adaptation, which is driven by evolution by natural selection. As environments change, the traits of organisms adapt, ensuring their continued survival and ability to reproduce.
Step-by-step explanation:
If the environment stays the same over time, it is expected that most organisms there exhibit a "good fit" with the environment due to the process of adaptation. This adaptation refers to the heritable traits that enhance an organism's survival and reproduction within its specific environment.
These traits come about through a process known as evolution by natural selection, which filters for characteristics that improve the organism's ability to survive, reproduce, and pass on beneficial traits to future generations.
Adaptations are not static but can change if the environment does. This dynamic process ensures that as the environment changes, so too do the characteristics of the organisms living in it, allowing for continuous adaptation. Examples of such adaptations include the heat-resistant Archaea in boiling hot springs, the precision in tongue length of a nectar-feeding moth, the webbed feet of a platypus, or the thick fur of a snow leopard.
Ultimately, individuals most adapted to their environment are more likely to survive and pass their advantageous characteristics on to their offspring, thus perpetuating the cycle of adaptation.