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Answer:
0.1 / acre or 1 / 10 acres
Explanation:
The density of an animal in a given area is given by the number of animals per unit of area.
In this case, we want to know the density of the mule deer in 1923 (100,000) divided by the total area of the Grand Canyon National forest Reserve (1,000,000 acres).
So, we'll simply divide 100,000 by 1,000,000 to get:
D = 100,000 / 1,000,000 = 0.1
The density of the mule deer within the Grand Canyon National forest Reserve is of 0.1 / acre or 1 / 10 acres