... High School , Phoenix . This study is concerned mainly with the designing ... Tucson . Seeds of the cholla cactus , Opuntia fulgida , were collected ... bell jar with the follow- ing percentages of gas : .14 % , .28 % , .55 % , and 2.8 ...
... High School , Phoenix . This study is concerned mainly with the designing ... Tucson . Seeds of the cholla cactus , Opuntia fulgida , were collected ... bell jar with the follow- ing percentages of gas : 14 % , .28 % , .55 % , and 2.8 ...
... flora and fauna , which at best have a tenacious existence ; summer ... Desierto are generally narrow , precipitous , sharp - crested ridges typical ... Desierto's climate is characterized by relatively hot , dry temperatures in both ...
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