JAMB - Biology (2007 - No. 7)
The highest level of ecological organization is the
ecosystem
population
biosphere
niche
Explication
The biosphere is the global sum of all ecosystems. The two joined words are "bio" and "sphere". It can also be termed as the zone of life on Earth, a closed system, and largely self-regulating. The biosphere is the highest level of ecological organization. It's the sum of all ecosystems on Earth and includes all living organisms and the factors that support life.