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
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
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