Variations is useful for give rise to new species and the survival of species in changed environment situations. Otherwise, they may be wiped out due to sudden change in niche. (Well - defined place of abode).

Variation is not necessary for individuals

Variation refers to the differences that exist among individuals within a species. While variation is important for the survival and evolution of a species, it is not necessary for individual organisms. Here's why:

1. Genetic basis:
Variation arises due to differences in the genetic makeup of individuals. Each individual inherits a unique combination of genes from their parents, which determines their physical and physiological characteristics. However, for an individual organism, it is not necessary to possess a wide range of genetic variation. As long as the individual has the necessary genetic traits to survive and reproduce, it can pass on its genes to the next generation.

2. Adaptation to the environment:
Individuals do not require a high degree of variation to adapt to their specific environment. Natural selection acts on the variation present within a population, favoring individuals with traits that are better suited to their environment. Through this process, individuals with advantageous traits are more likely to survive and reproduce, passing on their favorable genes to the next generation. Therefore, the focus is on the survival and reproductive success of individuals rather than the overall variation within a population.

3. Reproduction and continuity of species:
The primary goal of an individual organism is to reproduce and ensure the continuity of its species. Variation, on the other hand, is important at the population level for the long-term survival and evolution of a species. It allows for adaptation to changing environmental conditions and increases the chances of species survival in the face of challenges such as diseases, predation, and competition.

4. Genetic stability:
Having a high degree of variation within an individual organism can be disadvantageous in terms of genetic stability. Genetic stability is crucial for maintaining the normal functioning of an organism and preventing the occurrence of harmful mutations. A certain level of genetic uniformity within individuals helps in maintaining a stable and functional genome.

Conclusion:
While variation is essential for the survival and evolution of a species, it is not necessary for individual organisms. Individuals only need the genetic traits that allow them to survive and reproduce, rather than a wide range of genetic variation. The focus is on adaptation to the environment, reproduction, and the continuity of the species, rather than individual variation. Genetic stability within individuals is also important for their normal functioning.