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What external changes are visible after the last moult of a cockroach nymph?

1. Anal cerci develop
2. Both fore wings and hind wings develop
3. Labium develops
4. Mandibles become harder

Correct answer: Both fore wings and hind wings develop

Solution

In cockroach nymphs, most body parts are already present, but wings are absent or only wing pads are visible. After the last moult, the insect becomes an adult and both pairs of wings are fully developed.

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