A country with a declining fertility rate that is below 2.0
A) is graying.
B) has a population declining in size.
C) is increasingly common in highly developed nations.
D) All of these are true.
Question 2
A farmer extending his farm field bulldozes the banks of a creek, greatly disturbing the creek bed and stirring up clay and humus. The higher levels of clay and humus in the water just downstream will most likely result in
A) fewer plants, fewer fish, and cloudy water.
B) more plants but fewer fish and cloudy water.
C) more plants and more fish but cloudy water.
D) more plants and more fish and clearer water.
During their annual migration, the entire population of Arctic terns move from the Arctic Ocean in t
Details of plant population biology from repeat photography: (a) saguaro cactus in MacDougal Crater,
Details of plant population biology from repeat photography: (a) saguaro cactus in MacDougal Crater,
A close relationship between greenhouse gas emissions and a country’s gross domestic product
GDP per Capita by Country Group, 1820–2008
Age-Standardized Suicide Rates (per 100 000 Population), Both Sexes, 2016