Approximately how many base pairs must be duplicated at each cell cycle?
A) 3 x 10^6
B) 3 x 10^9
C) 3 x 10^12
D) 3 x 10^15
B
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How much land area is converted to deserts globally each year?
a. 10,000 square kilometers b. 25,000 square kilometers c. 40,000 square kilometers d. 55,000 square kilometers e. 70,000 square kilometers
Drawdown of groundwater due to heavy pumping from a well may result in a(n) ________, a "dimple" in the water table
A) geyser B) spring C) artesian well D) cone of depression
The process of cloud seeding is based on the theory that:
A) warm clouds will produce more rain if droplets are encouraged to freeze inside the cloud. B) silver iodide crystals act as freezing nuclei and enhance the Bergeron process. C) silver iodide crystals make droplets heavier than usual so that they fall to the ground. D) it is impossible to add too many freezing nuclei; the more you add, the more rain will fall.
Which of the following is not a proper symbol for an element?
A) C B) Ca C) CO D) Co