Question 4: There are also many natural factors that can cause changes in forests over time including ________, insects, diseases, weather, competition between species, etc.
Loss of old growth forest in the United States; 1620, 1850, and 1920 maps: These maps represent only virgin forest lost. Some regrowth has occurred but not to the age, size or extent of 1620 due to population increases and food cultivation. From William B. Greeley's, The Relation of Geography to Timber Supply, Economic Geography, 1925, vol. 1, p. 1-11. Source of "Today" map: compiled by George Draffan from roadless area map in The Big Outside: A Descriptive Inventory of the Big Wilderness Areas of the United States, by Dave Foreman and Howie Wolke (Harmony Books, 1992).
Question 7: ________ contains mainly natural patterns of biodiversity in established seral patterns, and they contain mainly species native to the region and habitat.