The main role of the national park service is to preserve natural ecology, providing public accessibility, and documenting historical significance. The correct option is D.
The National Park Service is a federal government agency headquartered in Washington, D.C.
It appears to be able all national parks, most historic landmarks, and other innate, historical, and recreation activities assets with various title designations.
The National Park Service safeguards the National Park System's natural and cultural resources and values for the amusement, education, and inspiration of current and future generations.
Without national parks, and by extension all types of nature reserves, our planet could be even hotter than it is now, and we would have lost thousands, if not hundreds of thousands, of species that still exist today.
Thus, the correct option is D.
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