niche - A squirrel collecting nuts for the winter., habitat - A hole in a tree filled with leaves., ecosystem - All of the squirrels, birds, trees, grass, flowers and the soil, water and air that help those things to survive., population - Five squirrels chasing each other., community - Five squirrels, a grove of oak trees, 4 blue birds, 6 chickadees, a field of grass., organism - One squirrel.,

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恢復自動保存: ?