| Answer | Crossword Clue |
|---|---|
| GHANA | Its major export is cacao |
| theobromine | A bitter, volatile compound obtained from cacao seeds. It is an alkaloid resembling caffeine in its physiological effects |
| HONDURAS | Its chief export is bananas. |
| OMAN | Its chief agricultural export is dates |
| COAL | Its burning is a major source of Beijing smog |
| keystone | species of plant or animal that produces a major impact (as by predation) on its ecosystem and is considered essential to maintaining optimum ecosystem function or structure |
