Ecology…is biosphere is not part of it?
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Question asks:
“Ecology is the study of environmental interactions at the following levels of increasing complexity:_____________.
(A)ecosystem, community, population, organism
(B)organism, population, community
(C)organism, population, community, ecosystem
(D)organism, population, community, ecosystem, biosphere
(E)population, community, ecosystem
The given answer is C. Is D not correct because biosphere is too large to be studied by ecology?

The answer is
(D)organism, population, community, ecosystem, biosphere
Hope this helps.
of course it is dear