| 1 | Some fruits and seeds have hulls. | |
| 2 | This kind of beetles have hard shell. | |
| 3 | With its shell damaged, the roach will soon die of dehydration. | |
| 4 | Their antennae and shells help them to detect and protect. | |
| 5 | "An enclosing structure or cover, such as a membrane or the outer coat of a virus. " |
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