In the context of population growth regulation, intrinsic factors are those that
A. increase reproductive success by a variety of means.
B. lower reproductive success by a variety of means.
C. operate within or between organisms.
D. are imposed on the population from outside.
Answer: C
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How can the age of a sample be determined from a graph of daughter and parent atoms versus time?
A) The y-intercept will show the amount of sample present in a certain mass. B) The intersection of the daughter and parent atom lines will show the age. C) The ratio of daughter to parent atoms will show the age. D) The slope can be interpreted to find the age.
The southeastern United States lies in the heart of the "horse latitudes" where normally we would expect desert conditions. Why isn't this area a desert?
A) Continental polar air masses disturb the pattern by periodic influxes of cold air. B) Maritime polar air masses disturb the pattern by driving pacific moisture across North America. C) Maritime tropical air masses derived from the Gulf of Mexico disturb the pattern when these air masses are drawn northward by cyclonic storms. D) Continental tropical air masses derived from Mexico disturb the pattern when these air masses are drawn northward by cyclonic storms.
If alternate fuels for vehicles could be sustainably and efficiently obtained by growing plants in the United States, we would expect
A) more jobs for U.S. citizens. B) an increase in the balance-of-payment deficit. C) another U.S. economic recession. D) that more oil would need to be pumped from offshore oil wells.
The most abundant gas released by volcanic eruptions is:
a. hydrogen sulfide b. carbon dioxide c. water vapor d. nitrogen