| 1 | Phytoplankton growth depends on the availability of carbon dioxide, sunlight, and nutrients. | |
| 2 | After the invention of the steam engine, the only limits were the amount of fuel and the reliability of the machine-both factors that people could control. | |
| 3 | Tick abundance in manicured lawns is also influenced by the amount of canopy vegetation and shade. | |
| 4 | 'How sunny it is outside has as big an impact on tipping quantity as does the service quality, ' he says. | |
| 5 | However, there was variability among chimpanzees in how much energy they used, and this difference corresponded to their different gaits and anatomy. |
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