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When One Part Fails: Local Trouble or System-Wide Ripple?

A household electrical fuse blows. What is the most likely immediate consequence?
Difficulty: Easy
A major road is blocked. Which outcome best illustrates a failure spreading through dependencies?
Difficulty: Easy
A home internet router fails while the modem and devices still have power. What is the most likely consequence?
Difficulty: Medium
One species disappears from a food web. Which explanation best captures why the effect might extend beyond that species?
Difficulty: Medium
A cooling system fails in a tightly coupled machine. Why could the initial local failure become system-wide?
Difficulty: Hard