How do biomes differ from ecosystems?
An example of an ecosystem is a pond. All of the living things in the pond (frogs, fish, bacteria, water plants etc.) are considered biotic factors . The abiotic factors of the pond ecosytem would include all of the non-living factors (water, light, dissolved oxygen, nitrates etc.) which are found in the pond.
A biome is a collection of different ecosystem that share similar climate conditions. Northeastern Minnesota is coniferous forest biome. In this region of the state of Minnesota you will find pond ecosystems, forest, rivers & streams etc.
This video discusses levels of organization in ecology, including discussion of ecosystems and biomes.
Hope this helps!