Complex networks of interconnected food chains are ____.
A. food webs
B. food distribution interactions
C. trophic levels
D. pyramids of energy
E. trophic chains
Answer: A
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What is an important result of divergent plates?
A) They spread, resulting in the formation of new seafloor along lines of submarine volcanoes. B) Plate subduction occurs, resulting in less seafloor. C) Plates slide past each other, resulting in violent earthquakes. D) They often cause tsunamis.
The U.S. population center of gravity has shifted
A) north to south. B) south to north. C) east to west. D) west to east. E) It is static.
Fish with jaws developed before jawless fish. Indicate whether the statement is true or false
An ordinary single-cell thunderstorm
A) typically lasts for an hour or less. B) is usually classified as a severe thunderstorm. C) is the least common type of thunderstorm. D) is the most destructive type of thunderstorm. E) none of the above