Figure 1.11 Exponential growth
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?In the accompanying figure, note that following the Black Death around 1350 A.D., the line representing the total human population rose dramatically. This rise indicates a fundamental relationship between births, deaths, and growth rates. Discuss this relationship, indicating why the steep rise occurred, and why an expected leveling off may occur soon.
What will be an ideal response?
The death rate fell without a drop in birth rates. Leveling off will result when birth rate drops.
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The force that acts on a planet orbiting the Sun is a
A. centripetal force. B. gravitational force. C. both of these D. none of the above
What molecule(s) is/are produced when hydrogen is used as an energy source?
A) Water B) Sulfur oxides and nitrogen oxides C) Carbon dioxide and nitrogen oxides D) Carbon monoxide
What is the term for changes that vary within a range of tolerance?
a. output b. feedback c. dynamic equilibrium d. threshold
When water is evaporated from a surface exposed to air, the surface is warmed; when condensation of evaporated water occurs, the air is cooled.
Answer the following statement true (T) or false (F)