The word which best completes the analogy "common : scarce :: human-made" is "natural," since the analogy consists of opposites or antonyms, as explained below.
We can describe an analogy as the relationship found between different words. Examples of such relationship are:
The analogy "common : scarce" draws a relationship of antonyms, which means the two words have opposite meanings. To complete it, we must find the opposite of "human-made." In this case, the best answer is "natural".
The missing answer choices for this question are:
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