 In this module, we will discuss different types of non-genetic variations. Basically, we divide the variation into two categories, genetic variations and non-genetic variations. So, there are different types of non-genetic variations which include individual variation in time, social variations, ecological variations, traumatic variations and post-modern variations. Now, we will discuss these variations one by one. So, first of all, individual variation in time. Individual variation in time can be further divided into different types like age variation, seasonal variation of individuals, seasonal variation of generations. So, first of all, what is age variation? If we talk about their different life stages in different organisms, then one organism can have different forms in its life which are clearly different from each other. For example, many organisms have immature larval forms and these immature larval forms are completely different from adults. Based on that, many taxonomists when they do not have detailed information about life cycle, then they can give names of different species in different stages. For example, if we talk about eel, angula and angula, which is a fish, its larval form is called leptocephalus brivi rostus. In 1856, it was considered a separate species. But later it was found out that it is not a separate species but a larval form. So, why did this happen? Because taxonomists did not have detailed information about life cycle and their early stage and adult stage were totally different from each other based on which they were kept in different species. Similarly, if we compare the early stages of butterfly, caterpillar and adult then there is a clear difference between the two. Because of this difference, they can be considered in different species. If taxonomists do not have detailed information about life cycle, then these variations are called age variations. Similarly, many organisms have variations in different seasons. For example, in summer, their color pattern may be different. In winter, their color pattern is different. For example, if we talk about arctic and subarctic birds, then in these birds, in winter, their color, their plumage color has a clear white color. But if we look at them in summer, then in summer, we can see their normal color pattern. For example, rock termigerian. In this, in summer, we can see gray and brown parts. But when we look at this bird in winter, then white plumage is present in winter. This is an example of seasonal variation.