Given below are two statements.

Statement I: The fitness, according to Darwin, refers ultimately and only to reproductive fitness. 

Statement II: Those who are better fit in an environment, leave more progeny than others. 

In the light of the above statements, choose the most appropriate answer from the options given below. 

Both statements are correct.

• Statement I: "The fitness, according to Darwin, refers ultimately and only to reproductive fitness" is accurate. Darwin's concept of fitness primarily relates to an organism's ability to reproduce and pass on its genetic traits to the next generation. In the context of natural selection, individuals with traits that enhance their reproductive success are considered more fit.
• Statement II: "Those who are better fit in an environment, leave more progeny than others" is also mentioned in Darwin's theory. Natural selection occurs when individuals with advantageous traits (better fit for their environment) have a higher likelihood of surviving and reproducing. This results in the increased representation of those traits in subsequent generations.

In summary, Darwin's theory of natural selection is based on the idea that organisms with traits that enhance their reproductive success are more likely to pass on those traits to the next generation, leading to the adaptation of populations to their environments over time.