Answer:
highly developed nation with an aging population
I think the answer is D) Medicine.
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Answer:
The Gold Rush was the largest mass migration in U.S. history. In March 1848, there were roughly 157,000 people in the California territory; 150,000 Native Americans, 6,500 of Spanish or Mexican descent known as Californios and fewer than 800 non-native Americans
Burning is any fire intentionally ignited to meet specific land management objectives, such as to reduce flammable fuels, restore ecosystem health, recycle nutrients, or prepare an area for new trees or vegetation
What features are you referring to
