An ecosystem is that it is a community or group of living organisms that live in and interact with each other in a specific environment.
Example: a wetland in East Africa
Biome
A biome is an area of the planet that can be classified according to the plants and animals that live in it.
Example: grassland
Biosphere
The biosphere represents the totality of all things on Earth, including their interactions. The biosphere includes all ecosystems on Earth and how they interact together.
Example: the Earth
Community
The community level focuses on the relationship between different species in a community. Predator and prey relationships play a large role in community-level analyses.
Example: the elephant and the crocodile
Population
A population contains a group of individual organisms of the same species and living in a specific geographic area -- which interact with one another.
Example: a parade of elephants
Individual
The first level of the ecological hierarchy. This level examines how one organism interacts with its environment.