What is a ecosystem?

A ecosystem is a system formed by the interaction of a community of organisms with their physical environment.

Any unit that includes all of the organisms (ie: the "community") in a given area interacting with the physical environment so that a flow of energy leads to clearly defined trophic structure, biotic diversity, and material cycles (ie: exchange of materials between living and nonliving parts) within the system is an ecosystem.
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What is a biome?

A biome is a major biotic community characterized by the dominant forms of plant life and the prevailing climate

Biomes are defined based on factors such as plant structures (such as trees, shrubs, and grasses), leaf types (such as broadleaf and needleleaf), plant spacing (forest, woodland, savanna), and climate.
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1. Arctic & Alpine Tundra
2. Coniferous Forest (Taiga)
3. Grassland (Prairie)
4. Deciduous Forest
5. Desert Biome
6. Tropical Rain Forest
7. Urban Sprawl