Farms owned by retirees who no longer cultivate crops are a. always considered small family farms regardless of acreage b. considered small family farms if they are less than 1,000 acres c. considered small family farms if they are less than 2,500 acres d. not counted in the number of us farms because the owners are no longer farming

d. stage 4

explanation:

the existence of some kind of demographic transition is widely accepted in the social sciences because of the well-established historical correlation linking dropping fertility to social and economic development.[1] scholars debate whether industrialization and higher incomes lead to lower population, or whether lower populations lead to industrialization and higher incomes. scholars also debate to what extent various proposed and sometimes inter-related factors such as higher per capita income,lower mortality, old-age security, and rise of demand for human capital are involved.[2]

they use tree rings to figure out weather patters.