6. The zone of life on planet Earth. The sum of all of the ecosystems on Earth. _____ *
A. Biosphere
B. Cell
C. Community
D. Ecosystem
E. Organ
F. Organism
G. Organ system
H. Population
I. Tissue

7. A community of living organisms, and their non-living parts of their environment. _____ *
A. Biosphere
B. Cell
C. Community
D. Ecosystem
E. Organ
F. Organism
G. Organ system
H. Population
I. Tissue

8. Any living thing that is composed of different organ systems that function altogether. _____ *
A. Biosphere
B. Cell
C. Community
D. Ecosystem
E. Organ
F. Organism
G. Organ system
H. Population
I. Tissue

9. A group of different populations in a particular area interacting with each other. ____ *
A. Biosphere
B. Cell
C. Community
D. Ecosystem
E. Organ
F. Organism
G. Organ system
H. Population
I. Tissue​