Answer :
Bears were once present as far south as California. Over time they have disappeared in most of the lower 48 states.
Human have influenced bear populations as they are a factor of resource competition for the bear species, due to the fact that the resource available in the environment have value to both humans and bears. Major changes in disturbance cycles and landscape mosaics brought by humans have further affected temporal and spatial pulses of bear food production. Air pollution has also affected bear food biomass on a small scale and is likely to have major future impacts on bear habitat climatic warming.
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