Problem: Darwin's barnacle studies convinced him that variation arose constantly and not just in response to changed circumstances. In 1854, he completed the last part of his Beagle-related writing and began working full-time on evolution. His thinking changed from the view that species formed in isolated populations only, as on islands, to an emphasis on speciation without isolation; that is, he saw increasing specialisation within large stable populations as continuously exploiting new ecological niches. He conducted empirical research focusing on difficulties with his theory. He studied the developmental and anatomical differences between different breeds of many domestic animals, became actively involved in fancy pigeon breeding, and experimented (with the help of his son Francis) on ways that plant seeds and animals might disperse across oceans to colonise distant islands. By 1856, his theory was much more sophisticated, with a mass of supporting evidence.
By which year had Darwin's theory become more complex and supported by a lot of evidence?
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Answer: 1856

Problem: NARA's holdings are classed into "record groups" reflecting the governmental department or agency from which they originated. Records include paper documents, microfilm, still pictures, motion pictures, and electronic media.
Besides films and other non-static media, what type of media is classified into a group?
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Answer: documents

Problem: North Carolinians enjoy outdoor recreation utilizing numerous local bike paths, 34 state parks, and 14 national parks. National Park Service units include the Appalachian National Scenic Trail, the Blue Ridge Parkway, Cape Hatteras National Seashore, Cape Lookout National Seashore, Carl Sandburg Home National Historic Site at Flat Rock, Fort Raleigh National Historic Site at Manteo, Great Smoky Mountains National Park, Guilford Courthouse National Military Park in Greensboro, Moores Creek National Battlefield near Currie in Pender County, the Overmountain Victory National Historic Trail, Old Salem National Historic Site in Winston-Salem, the Trail of Tears National Historic Trail, and Wright Brothers National Memorial in Kill Devil Hills. National Forests include Uwharrie National Forest in central North Carolina, Croatan National Forest in Eastern North Carolina, Pisgah National Forest in the northern mountains, and Nantahala National Forest in the southwestern part of the state.
Where is the Uwharrie national Forest located?
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Answer:
central North Carolina