On June 21, which location will be receiving 24 hours of daylight?
A) Antarctic Circle
B) Tropic of Cancer
C) Tropic of Capricorn
D) Arctic Circle
D) Arctic Circle
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300 million years ago Ancestral North America was
A) in its present day location. B) part of Pangea. C) at 60 degrees north latitude. D) at the south pole.
Two strategies have been successful in reducing birth rates. One alternative emphasizes reliance on education and health care, the other on distribution of contraceptives
Indicate whether the statement is true or false.
Mercury toxicity has been directly linked with which one of the following health problems in humans?
A. respiratory problems B. hepatitis C. neurological disorders and paralysis D. cancer E. digestive disorders
The changes in this field, from grasses to shrubs to trees, represent
A) ecological succession. B) climax production. C) biological evolution of new species. D) ecological adaptation.