Answer: Fitness describes how reproductively successful an organism is in its environment. A heritable trait that increases an individual's fitness is called an adaptation.
Step-by-step explanation:
To a transformative scholar, fitness basically implies reproductive achievement and reflects how well an organic entity is adjusted to its current circumstance.
The hypothesis of normal determination given by Darwin makes sense of the fitness of the species. This is the capacity of the living being to get by. The creature which have a stable reproductive capacity and can deliver sound posterity are more fit and have more opportunities to get by. The fitness of the species portrays the capacity of the species to proceed with life by reproduction.
Darwinian fitness of an organic entity is centered around it's reproductive fitness. It expressed that any species having better adaptibility will leave descendants through reproduction and hence will guarantee coherence on earth more than less versatile ones. Reproductively fit people get by and are chosen naturally.