Total fertility rate refers to ________
A) the potential number of offspring born per female in her reproductive years
B) the average age at which females become sexually active
C) the number of offspring born during a given year
D) the number of offspring that survive to become reproductive adults
E) the number of females giving birth during a given year
Answer: A
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A) leaf cover B) El Niño effects C) geology D) extent of continental ice cover E) sea-level rise
Which of the following chemical bonds is formed by atoms that have a strong tendency to give up or attract neutrons?
a. metallic b. covalent c. crystalline d. ionic
What do researchers use to directly measure the rate of productivity?
A) Carbon-12 B) Biomass C) Carbon-14 D) None of these choices
The horizon in which water moves fine particles downward in a process called eluviation is the ________ horizon
A) A B) O C) E D) B E) C