If we equate the entire Earth history to a single calendar year, then the human history only takes place in the last 30 seconds.
a. true
b. false
Ans: a. true
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Which of the following reactions illustrates an amphoteric compound?
A. NaOH + HBr ? NaBr + H2O B. 2 H2 + O2 ? 2 H2O C. 2 HF ? H2F+ + F- D. All are amphoteric. E. none of the above
Over the last three decades in the United States,
A) soil erosion has steadily increased while wind erosion has steadily decreased. B) estimates and actual measurements indicate that soil erosion has decreased. C) the increased reliance on plowing and technology has increased soil and wind erosion. D) measurements of the amount of soil in major rivers indicate great increases in soil erosion.
In which type of gene therapy is the patient given the virus directly?
A) in vitro B) in vivo C) ex vitro D) ex vivo
If movement becomes very rapid, a rockslide may break up and become ________.
A. a mudflow B. a debris flow C. a rock avalanche D. a soil slip E. a rock fall