| A traditional economy is a system where traditions, customs, belief systems, and inheritance determine the answer to the three economic questions. |
| A whistle-blower last night said a dodgy computer system was to blame for sparking travel chaos. |
| Drugs can modulate the activity of the sympathetic nervous system by affecting the synthesis, storage, release or reuptake of noradrenaline. |
| These findings illustrate that a prokaryote possesses a signal trafficking system with features common to those used by higher organisms. |
| This arrangement of eukaryote, bacteria, and archaea is called the three-domain system, replacing the two-empire system of simply eukaryote and prokaryote. |
| The sympathetic nervous system, not white blood cells, is critically important in the regulation of energy expenditure and thermogenesis. |
