| Another of the joys of the Inca Trail and Machu Picchu are the wild orchids that grow, although now in decreasing numbers as tourists pick them. |
| The bias is quantitatively important, but seems to be slowly decreasing over time. |
| The most common varieties are even vibration and damped vibration, according as the amplitude remains constant or it is decreasing exponentially. |
| Medical spending costs are increasing while the total effort going into government-funded medical research is decreasing. |
| Herbicides kill weedy plants, thus decreasing the competition for desired crop plants. |
| Dr. Young has found that taking tryptophan can affect human social behavior, decreasing aggression, irritability and quarrelsomeness. |
