The atmosphere of which of the following planets is composed primarily of carbon dioxide?
A. Earth
B. Mars
C. Jupiter
D. Uranus
Answer: B
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The reprocessing of nuclear fuel ________
A) is widely practiced in the United States B) requires the heavy use of lead and iron ore C) reduces and reuses the stockpile of nuclear waste D) requires additional mining of uranium
Which of the following is true of eutrophication in marine ecosystems?
A) Eutrophication aids the ecosystems by providing needed limiting nutrients, such as phosphorus. B) Eutrophication can kill fish. C) Eutrophication can aid corals by killing parasites. D) Eutrophication is rare and occurs only in bad weather.
In AMP, ADP and ATP, what type of linkage connects the phosphate to the sugar?
A) an anhydride B) an ester C) an ether D) none of these
What is the current approximate population of the world?
a. 7 million b. 10 million c. 5 billion d. 7 billion e. 10 billion