In the carbon cycle, atmospheric carbon dioxide is incorporated into carbohydrates in plant tissues through photosynthesis
Indicate whether the statement is true or false.
Answer: TRUE
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A pair of identical blocks are joined by a length of string on a friction-free table. When one block is pushed off the edge of the table, the taut string drags the other block horizontally across the table surface with an acceleration of
A. between zero and g. B. zero. C. g/2. D. greater than g. E. g.
Suppose a high concentration of oxygen 16 was found in the ice caves of Antarctica and Greenland. Which of the following conditions likely occurred at the time the ice was formed?
A. cold air temperatures B. intense ultraviolet radiation C. the caves were under the ocean D. mild winters
What type of metamorphism would occur in this setting? 
A. regional metamorphism B. contact metamorphism C. normal faulting D. subduction
Approximately how many plant and animal species have been identified?
A) 100,000 B) 1.75 million C) 3.4 million D) 13.6 million E) 111.7 million