What are the most common sources of groundwater contamination?
sewage, landfills, toxic waste disposal sites, and agriculture
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The physical environment neither affects nor limits the activities of humankind
Indicate whether the statement is true or false.
Although Homo erectus had migrated outside of Africa, some scientists believe that modern
humans evolved in one African location, and then migrated from Africa. Indicate whether the statement is true or false.
Which of the following is the vector commonly used in in vivo gene therapy?
A) adenovirus B) Maloney murine leukemia virus C) weakened flu virus D) vaccinia virus
Desertification is ____.?
a. ?strongly linked to human activity b. ?only a problem in areas near existing deserts c. ?occurring mostly in regions near the equator d. ?not a significant problem in the United States e. ?a slow natural process that does not cause large economic losses