31. The P _ _ 2 } homeostat is an important component of the acclimatization to high altitude. 32. In most of these cases, the symptoms are temporary and usually abate as altitude acclimatization occurs. 33. Plants raised in protected conditions usually need a period of acclimatization , known as frost hardiness ). 34. After vigorous sauna-training and desert-acclimatization , he attempted the run again in 1975. 35. Part of the reserve included portions of steppe reserve, an acclimatization zoo, and an arboretum. 36. The route described below includes the'Mawenzi Tarn Hut variation'which is recommended for acclimatization . 37. To promote the process of acclimatization the participants alternated their travelling methods between walking and horse riding. 38. The Russian president is feeling well, " only the acclimatization is proceeding rather difficultly," 39. Aberhart said South African conditions, which might advantage batsmen, would also pose a challenge of acclimatization . 40. The role of genetic factors is not clear because it is difficult to differentiate between adaptation and acclimatization .