Poor farming practices, such as plowing land straight up and down a hill, led to the formation of the Providence Canyon in Georgia in a process called _____.
A. root stripping
B. soil redistribution
C. soil erosion
D. leaching
E. vesselization
Answer: C
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In humans, the stomach secretes (select all correct choices):
A. pepsin, an enzyme that digests proteins. B. enzymes that digest lipids. C. hydrochloric acid. D. amylase. E. cellulase.
Homologous chromosomes separate in ________ and sister chromatids separate in ________
a. meiosis I / meiosis II only b. meiosis II / meiosis I c. both meiosis I and meiosis II / both meiosis I and meiosis II d. meiosis I / meiosis II and mitosis
Altruism in animals
a. lowers their chances of perpetuating their own genes. b. has no genetic basis. c. is a conscious effort to preserve the species. d. is just lucky behavior. e. includes none of these
The most widely accepted model for the evolution of modern humans is pictured here. What is this model called? 
A. Out-of-Africa and Replacement Model B. Hardy-Weinberg C. Multiregional continuity D. Replacement Model E. Out-of-Africa