Many species of field mice are able to reproduce several times a year and produce litters with multiple offspring. However, an ecologist noted that the population size of mice, as measured in a California grassland, did not change from year to year
The factors that keep natural populations from increasing are collectively called
A) scramble competition.
B) nonliving factors.
C) exponential growth.
D) biotic potential.
E) environmental resistance.
E
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Which substance is a fossil fuel?
A) vegetable oil B) coal C) hydrogen gas D) wood
Only charged atoms can form ionic bonds.
Answer the following statement true (T) or false (F)
Quorum sensing is used by bacterial cells to determine which of the following?
A. the size of the population B. the availability of nutrients C. the speed of water flow D. the density of the population
Radon is a radioactive gas that seeps into homes from the soil. It is thought to be a cause of lung cancer. A research team investigates this hypothesis. The members of the team gather large amounts of data on basement radon concentrations and lung cancer rates and conclude that the more radon there is in a home, the more likely are people living in the home to develop lung cancer. After the study is published, other researchers criticize it by asserting that the studied neighborhoods with higher radon concentrations also have a higher percentage of older people and a higher percentage of cigarette smokers than the low-radon neighborhoods. Both advanced age and cigarette smoking increase the risk of lung cancer. This criticism, if correct, shows that the radon study suffered from
__________. Fill in the blank(s) with the appropriate word(s).