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.
The Dingo was the first placental mammal introduced to Australia, around 4000 years ago
Cottontails' ears have developed to hear even whisper-quiet sounds at incredible distances.
A levallois core from Kapedo Tuffs, Kenya dates about 130,000 years ago.
In 1839 Mary Cragin, at the age of twenty-nine, became a convert to John Humphrey Noyes’s “communism
Americium-243 has a decay constant of 9.39 × 10-5 years-1. How long will it take
Cyanobacteria from 850 million years ago (Photo 2)