In nature variations occur continuously.These variations are aimed at the selection of better adaptive features that help in survival of the generations.

Introduction:
The question pertains to the concept of variation in nature exhibits. Variation refers to the differences or deviations that can be observed among individuals or objects within a particular group or population. In this context, we need to determine whether the variation observed in nature exhibits is continuous, discontinuous, uniform, or discrete.

Continuous Variation:
Continuous variation refers to a type of variation where the characteristics or traits of individuals within a population form a wide range of values with no distinct categories or breaks. In other words, there is a gradual and smooth transition between different values. This type of variation is typically observed in traits that are influenced by multiple genes and environmental factors.

Discontinuous Variation:
Discontinuous variation, on the other hand, refers to a type of variation where the characteristics or traits of individuals within a population fall into distinct categories or groups. There are clear breaks or gaps between these categories, and there is no overlap between them. This type of variation is usually observed in traits that are controlled by a small number of genes with distinct phenotypic expressions.

Uniform Variation:
Uniform variation is a term used to describe a situation where there is little or no variation among individuals within a population. All individuals exhibit the same or very similar characteristics or traits. This type of variation is relatively rare in nature and is often observed in highly controlled environments or artificially selected populations.

Discrete Variation:
Discrete variation refers to a type of variation where the characteristics or traits of individuals within a population can be categorized into distinct groups or classes. However, unlike in discontinuous variation, there may be some overlap between these groups. This type of variation is typically observed in traits that are influenced by a few genes with a limited number of phenotypic expressions.

Conclusion:
Based on the given options, the correct answer is option 'A' - continuous. Nature exhibits typically show continuous variation, as many traits in nature are influenced by multiple genes and environmental factors, leading to a wide range of values with no distinct breaks or categories.