The American alligator was almost hunted to extinction, but was protected starting in the late 1960s and has made a remarkable recovery. Which best describes the change in overall biodiversity that occurred from 1960 to 2000 in ecosystems due to changes in alligator population? Confine your analysis to ecosystems where alligators are native and ignore the contribution due to changes in the alligator population.
A. increased
B. decreased
C. stayed the same
D. impossible to determine
Answer: A
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This figure shows the Moon at four different positions, representing four different times, as it orbits around Earth. At which position would there be a full Moon as seen from Earth?
A. 1 B. 2 C. 3 D. 4
What happens when dissolution occurs between halite and water?
A) Halite crystals break into sodium and calcium ions, which exist invisibly between water molecules. B) Halite crystals disappear and only water molecules end up being present. C) Water molecules break into hydrogen and oxygen ions, which exist invisibly between halite crystals. D) Water molecules disappear and only halite crystals end up being present.
Large volcanic eruptions with an ash veil that enters the stratosphere, tend to __________ at the
surface. a. increase temperatures b. increase precipitation c. decrease temperatures d. have no effect
The East African rift is a divergent plate boundary that is splitting the continent of Africa into two pieces. What will eventually form around this divergent boundary?
a) a continent b) a convergent boundary c) a transform boundary d) an ocean e) a hurricane