In the Southern Hemisphere, the greatest number of daylight hours occurs on ________.
December 21
June 21
March 21
September 21
December 21
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When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. The reason for this is
A) iron gets hotter before copper. B) copper gets hotter before iron. C) copper expands more than iron. D) iron expands more than copper. E) none of the above
In an ecosystem, the elimination of one new species by another because of direct competition for the same resources is an example of
A) intraspecific competition. B) the competitive exclusion principle. C) character displacement. D) resource partitioning.
The planet with the highest density is a terrestrial planet
Indicate whether the statement is true or false
The intensity of cosmic rays bombarding Earth's surface is largest at the
A) poles. B) midlatitudes. C) equator.