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A. Periplaneta americana is nocturnal, omnivorous, household pest. R. It is because it acts as scavenger.

1. A is true but R is false
2. A is false but R is true
3. Both A and R are true and R is correct explanation of A
4. Both A and R are true but R is not correct explanation of A

Correct answer: Both A and R are true but R is not correct explanation of A

Solution

A is true because Periplaneta americana is indeed nocturnal, omnivorous, and a common household pest. R is also true since cockroaches act as scavengers, but that fact explains only the omnivorous feeding habit, not nocturnality or pest status.

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