Final answer:
The prefix 'ob-' in 'obstructive' means blocking something.
Explanation:
The prefix ob- in the word obstructive means blocking something. In this context, obstructive refers to causing an obstruction or hindrance. For example, in the sentence, 'Her constant lateness was obstructive to the team's goal of winning the state basketball championship,' obstructive implies that her behavior was creating a barrier or impediment to the team's success.
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