Community
Organism
Biosphere
Ecosystem
Organ system
11. Two or more organs coordinate their activities towards a
common activity.
12. A gathering of many populations occupying a given area
at a given time interval.
13. A relatively self-contained, dynamic system composed of
a natural community along with its physical environment.
14. They are called individuals living in a community.
15. The regions of the surface, atmosphere, and hydrosphere
of the earth occupied by living organisms.​