The correct answer is option B. "Make a second terrarium that has no plants but is otherwise identical".
Explanation:
Transpiration and evaporation are two processes that are key for the hydrological cycle, allowing the return of water to the atmosphere in a gaseous form. In the two processes water is evaporated, with the main difference that water evaporation occurs directly from the soil, and transpiration is a biological process at which water is evaporated from plant cells. Therefore, if it is needed to distinguish between transpiration and evaporation in a model ecosystem, make a second terrarium that has no plants but is otherwise identical will be a valid approach.
According to the biological species concept, species are natural populations of organisms that have the potential to interbreed and that are <span>reproductively isolated from other such populations.
