JLAB Biology SOL Practice Test

The density of Rocky Mountain mule deer in the Grand Canyon National Forest Reserve by 1923 is identified as approximately 1 deer for every 10 acres. This figure reflects the population density that was observed in the region during that time period, indicating a relatively moderate concentration of deer in relation to the available land. This density figure suggests that the habitat was capable of supporting a population of deer while still allowing sufficient space for their movements and access to food and water resources. The number reflects a balance between population size and habitat capacity, which is crucial for understanding wildlife management practices and ecological studies.

In this context, the other choices represent different densities that do not match historical data. For example, a density of 1 deer for every 20 acres would imply a lower population density than observed, while 1 for every 5 acres would suggest a much higher density that might not be sustainable in the habitat. Thus, the choice of 1 for every 10 acres accurately captures the state of mule deer populations in that area at the specified time.