If in a developed nation the width of the bars for an age group of 35 to 40 years decreases for three successive censuses, which one of the following statements is likely to be true?
A) There has been high emigration in that age group.
B) The fertility has increased in that age group.
C) The fertility has decreased in that age group.
D) Other age groups have increased their fertility to compensate for the 35 to 40 age group.
Question 2
Good health in the modern world, with few cases of bacterial infection, is largely the result of
A) the development and widespread use of new immunizations.
B) clean water supplies and proper treatment of sewage.
C) widespread use of bleach, antibiotics, and antibacterial soaps.
D) frequent bathing and washing of clothing and dishes.
History of the number of observed sunspots during the last 250 years, which shows the ~11-year solar
Possible Earth 5 billion years from now
Relationships and dates divergence of living primate group based on molecular and DNA comparisons.
A Healthy Daily Food Plan A variety of foods from each group creates a well-balanced diet
GDP per Capita by Country Group, 1820–2008
Pangaea 200 Million Years Ago