Answer it in English language

A trait that is more prevalent in a population has generally had more time to spread and become common.
Trait A exists in 10% of the population.
Trait B exists in 60% of the population.
Since Trait B is present in a larger percentage of the population, it is more likely to have arisen earlier.

The trait likely to have arisen earlier is Trait B.

Variations provide a range of characteristics within a species. When environmental conditions change (e.g., disease, climate shifts, new predators), some individuals with specific variations may possess traits that allow them to survive and reproduce more effectively than others. This differential survival ensures that at least some members of the species can adapt to new challenges, preventing the entire species from being wiped out and thus promoting its long-term survival.

The creation of variations in a species promotes survival by increasing the chances that some individuals will possess traits advantageous for adapting to changing environmental conditions, thereby ensuring the continuation of the species.