To determine the flask's carrying capacity for rotifers in the absence of water fleas, you would typically look at the data or results provided in an experiment or study. However, based on your question format, it appears you are providing options without context or data for reference.
If we are to choose the most plausible number based solely on the listed options (4,200, 0, 3,000, and 1,800), we would need additional information to make an informed choice. In studies involving carrying capacities, higher numbers usually indicate a greater ability of the environment to support a population.
Without specific data, it's impossible to definitively answer; however, assuming you need to select one of the options, 4,200 could be a reasonable choice as it indicates a higher carrying capacity.
So if I need to choose, I would go with:
4,200
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