 In this module, we will discuss different types of ecological variations. We can classify ecological variations into habitat variations, variation induced by climatic conditions, host-determined variations, density-dependent variations, allometric variations, neurogenic color variations. Now we will discuss these variations one by one. First of all, habitat variation. If we look at a species of members in different habitats, we can see variations from there. Because we discussed that a species of members has phenotypic plasticity. Because the niche of a species is quite broad. When a species of member lives in different types of habitats, environmental conditions vary in different habitats. Because of these environmental conditions, there are variations in the organisms. These variations can be color variations or variations in any other species. We had also seen that less variable types of species are more taxonomically important. And the types of species with more variability are called low-weightage species. If we talk about oyster, the shape of the oyster is round and it is broader. But if any oyster is present in strong currents, it is narrow, elongated and usually straight because of strong water currents. Similarly, if the oyster is present in clean water and on pebbles, then its lower valve is deeper, more or less sharply ripped to acquire strength. The change in its structure is that the surface where it is present has to acquire strength. But if it is present in a place where the surface is smooth, then its character varies. Similarly, if an oyster is present in a muddy area, then its lower valve is commonly less ripped to acquire strength. So, the variation in different habitats is different. So, the structure of the lower valve changes in order to acquire strength. So, this is an ecological variation because in different habitats, the conditions are different. So, the variation in the organisms also depends on that, so that they can adjust themselves properly.