An ecosystem is composed of what?
A - The populations of all species within a geographical area
B - The populations of all species and all abiotic factors within a geographical area
C - All of the environments and all of the communities on the planet
D - All abiotic factors within a geographical area
E - All of the individual organisms belonging to the same species within a geographical area
Answer: B - The populations of all species and all abiotic factors within a geographical area