Because of fluctuations in the environment, such as depletion of food supply or an outbreak of disease,
a population may periodically experience a rapid and marked decrease in number of individuals,
leading to a form of genetic drift called
a. a founders effect.
b. migration.
c. gene flow.
d. natural selection.
e. a genetic bottleneck.
E
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Darker skin color is correlated with ____
a. the northern hemisphere b. inland regions c. coastal regions d. longitude e. the intensity of UV radiation
Women are more likely than men to get urinary tract infections due to anatomy
Indicate whether this statement is TRUE or FALSE.
"K" is the chemical symbol for
A. phosphorus. B. potassium. C. nickel. D. krypton. E. copper.
Invasive species are introduced by humans to new geographic locations and:
A) are successful in colonizing a novel area. B) spread because they encounter none of their natural predators. C) All of the choices are correct. D) can outcompete and displace native species for biotic and abiotic resources. E) are usually considered pests by ecologists.