The ability to survive and reproduce
It's a adaptation.
This is designated as the organisms fitness.
Fitness
It Is Fitness.
Fitness -Apex (Survival of the Fitness)
Organisms that are less fit can die before they reproduce. This is statistically more likely for such organisms. Organisms that are less fit have problems getting mates as they are passed over in greater numbers than fit organisms. Organisms that are less fit can not bring the offspring to term and provide as well for the offspring as fit organisms can. Organisms that are less fit pass on to their progeny the genetic insults that they carry, thus their offspring are less fit also. And many other reasons could be thought of here, so you think of some reasons yourself.
increases the probability that organisms with this adaptation will reproduce
contribution to the gene pool of the next generation
The ability of organisms to survive and reproduce under a range of environmental circumstances is known as ecological resilience. This trait allows organisms to adapt to changing conditions, such as temperature fluctuations, resource availability, or habitat disturbances, ensuring their continued existence and reproduction. Organisms with high ecological resilience are better equipped to thrive in diverse environments and withstand environmental stresses.
Because fitness means exactly that. The ability to survive and reproduce - pass on genes.
Fitness is a measure of the average reproductive alacrity of a particular variant, lineage or population.Adaptation is a genomic change that increases fitness for the variants or lineages carrying the change.
Better adaptions in the immediate environment leading to greater reproductive success. All organisms in a population are variations and in the immediate environment some organisms are better suited to survive and reproduce against their conspecifics. They have greater fitness.