Habitat
The place where an organism lives
Population
All the organisms of one species living in a habitat
Community
The population of different species living in a habitat
Abiotic factors
Non living factors of the environment
Biotic factors
Living factors of the environment e.g temperature
Ecosystem
The interaction of a community of living organisms (biotic) with the non-living (abiotic) pets of their environment
Ecology
The interaction of a community biotic organisms with the abiotic parts of the environment