Solution –
1. Figure 1 represents single population (A). All individuals of the same species are interacting among themselves and their environment only.
2. Figure 2 represents three species which are A and B and C . These three species are interacting among themselves and their environment.
3. Figure 3 shows a biome. It has three communities. Each community has a different species. These three communities are interacting with each other and the environment forming a biome