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Two common characters found in centipede, cockroach and crab are:

1. Jointed legs and chitinous exoskeleton
2. Green gland and tracheae
3. Book lungs and antennae
4. Compound eyes and anal cerci

Correct answer: Jointed legs and chitinous exoskeleton

Solution

Centipedes, cockroaches, and crabs are all arthropods, so they share a chitinous exoskeleton and jointed appendages. Other choices include structures that are absent in one or more of these groups.

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