Pioneers who crossed the western mountains in the mid-1800s were threatened by exposure to too much sun. apache and comanche attacks. snow and cold temperatures. slow travel across sand.

The correct answer is C) snow and cold temperatures.

The Pioneers who crossed the Western mountains in mid-1800s were threatened by snow and cold temperatures.

The Pioneers faced so many dangers when they crossed the Western mountains in the 1800s. The heavy snow, the extremely cold weather, and the wildlife were among the threatens during their expeditions. Diseases stroke many of the Pioneers who died in the intent to cross the mountains.  

in contrast, the biological controls are self-sustaining, inexpensive and very effective once established. biological control could be used on thousands of golf course acres, improving their biodiversity and quality as wildlife habitat. in the process, the golf industry will be shown to be leaders in an environmental stewardship program of benefit not only to the lands they manage but also to the watersheds in which they exist.

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