The causes of the current (sixth) mass extinction include all of the following EXCEPT ________
A) pollution from pesticides, eutrophication, and other causes
B) habitat alteration and destruction
C) global climate change
D) earthquakes, tsunamis, and forest fires
E) invasive exotic species
Answer: D
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Which one of the following items is a major disadvantage of animal feed lots?
a. Less land is required to feed the animals. b. Use of antibiotics can increase genetic resistance to microbes in humans. c. Soil erosion is reduced. d. Overgrazing is reduced. e. Biodiversity is protected.
In primary recycling, waste products are converted into different products
Indicate whether the statement is true or false
What happens to the pH of a 1M solution of hydrochloric acid, HCl, as carbon dioxide gas is bubbled into it?
A. The pH remains unchanged. Carbon dioxide is unable to affect the pH in the presence of such a concentrated solution of such a strong acid. B. At first, the pH will increase as carbon dioxide ties up the hydrogen ions from the solution. Once the concentration of the resulting carbonic acid becomes greater than 1M, the pH will begin to decrease indicating the presence of more acid. C. The pH increases as the solution becomes more basic since the carbon dioxide continues to tie up more and more of the hydrogen ions as associated carbonic acid molecules. D. The pH decreases as the solution becomes more acidic since carbon dioxide reacts to form carbonic acid thus increasing the overall acid concentration.
According to the textbook, humans have always migrated, beginning about ________ years ago
A) 500,000 B) 200,000 C) 100,000 D) 60,000 E) 30,000