The relationship between frogs and insects is an example of
A. intraspecific competition.
B. competitive exclusion.
C. coevolution.
D. a predator-prey relationship.
Answer: D
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Some of the world's most economically and politically important countries lie in the European core, a zone stretching across northwest and north central Europe
a. True b. False Indicate whether the statement is true or false
For nearly 50 years, a farmer has raised corn and soybeans on his family's 1,000-acre farm by a river. Now in retirement, the farmer wants to return the farmland to its natural state as a wetland in the floodplain of the river
The farmer will most need the services of A) a crop scientist. B) a restoration ecologist and data from LTER projects. C) an agricultural engineer with training in successional dynamics. D) a functional morphologist.
The Asian region is about twice the size of the United States, with regard to land area, with about 8 million square miles
Indicate whether the statement is true or false
For which of the following mineral resources is the United States most dependent on imports?
a. nickel b. copper c. chromium d. graphite e. tin