Answer: Fitness
Step-by-step explanation:
Fitness of an organism defines the ability of the organism to survive and reproduce in a condition. The condition can be feasible or non feasible.
In case the condition is feasible the organism will survive and reproduce but in case the environment is not feasible then the fittest organism will adapt the environment and survive in the situation.
Hence, the fitness of the organism will allow it to adapt the environment, survive and reproduce.