The correct answer is C. Microcosm
Explanation:
In biology and ecology, one of the techniques used to study ecosystem is the creation of artificial ecosystem or models of ecosystems that can be placed indoor in a laboratory or outdoor and are called microcosms, as they represent a larger and more complex ecosystem. Microcosms are considered as one important technique to study natural processes because they allow testing in a controlled way and without having effects on the real macro ecosystem. Therefore, a re-created ecosystem in a laboratory environment is a microcosm.
