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The cheatgrass may bring it to become where the animals may not approach the Sagebrush, cause a possible overgrowth, or may take over the land itself.
Animals that use the Sagebrush as a part of their diet, or as a place to hide or place their young, will have to fight to try and ger near the plant, otherwise they may have to leave
There may most likely be no benefits from this invasive species.
As said, this is a highly flammable plant, which may cause destruction to other plants or animals; it injures animals which approach near, and growing by the Steppe may cause animals to stop approaching and eating.

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~The new arrival to the area happened to be the Downy Brome, or Cheatgrass.
~It is a rapid growing, hard plant which grows on disturbed lands.
~It came from the Mediterranean region and arrived to the US by packing matterials and possibly as seed contaminants.
~Happens to be unpalatable and can injure livestock with the sharp-edged seed clusters.
Is a highly flammable plant that takes up over 100 million acres in the US.

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The Pronghorn seems to be the most likely to be a Keystone Species. Their diet is 90% Shrub-Steppe, helping keep from overgrowing and taking over the land.

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-The Shrub-Steppe has been able to plant roots deep into the ground to reach nutrients and water; photosynthesis has been achieved even in darkness.
-For the Pronghorn, the Sagebrush makes up 90% of the diet.
-Sage Sparrows/Brewer's sparrows create nests in the brush.
-"Mule deer hide their fawns in the brush."
The Sage Grouse happens to use the brush for protection from sun, snow, and wind.
Spare ground around the Steppe lets male grouses to perform annual mating dances.
- Helps to feed predator species by drawing in small mammals and birds.
- The Sagebrush Shrub-Steppe helps the environment by also stabilizing soils and helps prevent erosion

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-The ecosystem surrounding the shrub-steppes contains which are fed off of be Sage grouse/sparrows/lizard/vole.
-Animals included in the area happen to be 23 amphibians/reptiles, a hundred different bird species, and 70 mammals.

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http://science-ed.pnnl.gov/pals/resource/cards/shrubsteppe.stm
http://www.pbs.org/wnet/nature/sagebrush-sea-food-web/12265/