Baobab tree species are old-growth trees that are disappearing. This tree survives the desert-like conditions by storing water in its large bottle-shaped trunk. Six baobab tree species are found in ____.
A. Ethiopia
B. Crete
C. Madagascar
D. Somalia
E. Greece
Answer: C
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Which areas of the world are already facing and will most likely continue to face the most water scarcity?
A. Arctic and Antarctic B. Eastern and Western Europe C. Asia, Africa and the Middle East D. United States and Canada E. Australia and New Zealand
Given an alkane, an alkene, and an alkyne, each of which contains two carbon atoms, which compound will contain most hydrogen atoms?
A) the alkane B) the alkene C) the alkyne D) None, they all contain the same number of hydrogen atoms.
How many electrons are consumed when H+ and O2 combine to produce two molecules of water?
A) 1 B) 2 C) 3 D) 4
The average temperature increase in the shallow crust (the geothermal gradient) is about ________ degrees C per kilometer.
A. 2 B. 25 C. 10 D. 5 E. 15