Which of the following elements are in the same period as magnesium (Mg)?
A. Sr
B. Mn
C. Ca
D. Cl
E. none of the above
Answer: D
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In a population with a tar of 2, the
A) CBR = CDR. B) doubling time = 0. C) life expectancy = 0 D) IMR = 0. E) Demographic Transition is in full swing.
Ground that remains permanently frozen is called ____________________
Fill in the blank(s) with correct word
Which statement correctly describes hunting and gathering today?
A) A very small percentage of humans today practice hunting and gathering. B) 1 out of 10 people on the planet practice hunting and gathering. C) The men focused on collecting berries, nuts, and roots. D) Hunter gatherers live in large communities. E) The groups traveled infrequently.
Which of the following is an advantage of wind power?
A. Variable winds allow variable amounts of power generation. B. Wind turbines are attractive in scenic places, like off Cape Cod. C. It already provides a large percentage of the world's power requirements. D. It can be used nearly everywhere because all areas are windy enough. E. Wind power is renewable and can be used in remote locations.