Let's see how we can use the toolbars in ArcGIS Online's map viewer to add global biomes data. We're starting off with the topographic base map, which we can see in the base map gallery by clicking the left vertical bar, so we can see the range of base maps, and you'll see the topographic layer is shown there by default. We can always change this base map to an alternative, such as imagery, and that shows satellites and aerial imagery from all around the world, and we can also zoom in and out on any of these base maps to show more detail, like this. So this particular map is preloaded with layers, and we can look at those now by clicking the layers button in the vertical panel, and that reveals a set of layers that are all connected with biomes. Let's take a look at the first one, which is called World Biomes All, and if I click the visibility little eye there, it will appear, and then I can shut the layers panel so we can have a good look at the map. If we're not quite sure what the layer colours mean, there's a legend button we can press here to get some idea of what's going on with those colours. So we can see here we have all the biomes shown, going from desert to grassland, lake, rock and ice, taiga, temperate forest, tropical forest, and tundra. We can also click on the layers to get some idea of which layer we're looking at at any time. That's quite useful, and if we want to zoom in on any particular area, we can do that as well. As before, we can just zoom in, so for example, here, we're looking at the boundary between the desert biome. In this case, it's the Sahara Desert in North Africa, and the biome just to the south of it, which is grassland. Before we go on to look at the distribution of the biomes in a bit more detail, let's just return to think about the base maps we're using. We talked about a little bit earlier on, but if we look at the base map gallery, we can see why this is important. So for example, we can add details in terms of labels to the map, which is obviously gonna be useful so that we know where we are, by adding imagery hybrid instead, so we're changing the base map to imagery hybrid, and that shows us lots of details about where places are in the world, and once again, if we zoom down, we can start seeing lots and lots of detail, and the detail will improve for anywhere you go in the world. If I just zoom in like this, you can see more and more place names, for example, and borders, including internal borders. That's quite a lot of information for us to deal with, so perhaps we don't want that, so if we go back to imagery, but then change to another layer, let's go for another layer. This time, we're gonna go for one called light grey canvas, but you can see it's very pale, and it's more difficult to see the colours of the biomes, so we could change it, perhaps, to dark grey canvas, and with this layer, the biomes really stand out much more clearly. Another alternative might be to try a base map called oceans. Although the oceans layer can be very useful for many purposes, in this case, it doesn't really have enough contrast with the terrestrial biomes, a little bit like the light grey canvas problem, so perhaps dark grey canvas is a good one to choose, or indeed, if we go back to imagery, which we started with. So different base maps can be used to improve the visualisation of the data layer we're looking at, so in this case, with biomes, we found that it helps to have a layer underneath, the base map underneath, that provides contrast to improve the visualisation of the data that we're interested in.