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Scientists measured the electromagnetic (EM) radiation reflected or emitted by more than 2,100 eggs laid by 251 different kinds of birds. This research suggests that some aspect of the EM spectrum might be an important factor used by birds to identify a given egg.

Which of the following is the LEAST appropriate test to determine the validity of this claim?


Paint a blackcap warbler's eggs with a UV blocker, and place it among other non-blocked eggs in the warbler's nest.


Paint a single robin's egg white, and place it among other regular (blue) robin's eggs.


Remove a cuckoo egg from its nest at 8 A.M., and return it to the same nest four hours later.


Heat a model (fake) egg to match the temperature of other real robin eggs, while ensuring that is otherwise identical.

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