Science task 221: The data come from an unfamiliar biomedical or physical-science investigation and must be reasoned from first principles. The setting is a physiology laboratory. For dilution stimulus 221, what is the final concentration?

Science task 221: The data come from an unfamiliar biomedical or physical-science investigation and must be reasoned from first principles. The setting is a physiology laboratory. For dilution stimulus 221, what is the final concentration?

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