To maintain steady total populations in future decades, most European countries will need to
A) decrease fertility rates.
B) increase their total fertility rate and/or accept more immigrants.
C) encourage emigration.
D) encourage the use of birth control.
B
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Phil tosses a ball horizontally from a rooftop. One second after leaving his hand the ball's vertical component of velocity is about
A. 20 m/s. B. 10 m/s. C. 14 m/s. D. 5 m/s.
The EPA is authorized by the Toxic Substances Control Act (TSCA) to test the safety of chemicals used in bulk in the manufacturing of products
When passed, these regulations required the testing of existing and new chemicals when there are indications of potential risks. Since TSCA was passed, the EPA has A) reversed this guideline, requiring the testing only for substances that are known carcinogens. B) tested and banned more than 300 new and existing substances. C) tested the safety of about half of the 80,000 chemical substances in the inventory. D) tested the safety of less than 1% of the chemical substances in the inventory.
The projection put forth by the World Commission on Water was that half the world's population will be living under severe water stress by the year
a. 2025. b. 2015. c. 2020. d. 2030. e. 2040.
As a golf ball falls after rolling off the edge of a table, its vertical component of motion
A. remains constant. B. increases. C. cannot be analyzed. D. decreases.