Taking into account the animals and the landscape being mentioned, we can confirm that the combination of these forms part of an ecosystem.
An ecosystem is described as an area consisting of:
and many other factors, which all work together to form a small pocket of life.
Ecosystems are described as containing both living and non-living elements, meaning biotic and non-biotic parts. A community or population, on the other hand, are used to consider only the biotic or living factors of an ecosystem. Therefore, since the question includes the rock bottom (a non-biotic factor) as a part of the makeup, the only correct grouping is that of an ecosystem.
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