Cruisers are thought to have relatively high body temperature because ________
A) it assists them in predator avoidance
B) it helps them blend more easily with their environment
C) it increases the power output of muscle tissue
D) they are cold blooded
E) they only need to move periodically
C
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The average depth of the ocean is about ________.
A. 3800 m B. 3800 mi C. 11,000 mi D. 11,000 m E. 3900 km
Africa South of the Sahara
A. is a wealthy region B. has only one ethnic group C. has a history of democratic government D. is the cradle of the human race
Which of the following statements regarding the impact of landfills on ground and surface water is correct?
A. The water that passes through a landfill is collected and treated. B. Landfills should be surrounded by highly permeable soils. C. Landfills should be located below the water table. D. Landfills do not generate liquid waste so they have no impact on ground or surface water.
The newly-formed Earth’s atmosphere was very different from Earth’s current atmosphere because it had ____
a. an abundance of mercury vapor b. an enormous amount of carbon dioxide, resulting in very hot temperatures due to greenhouse effect c. virtually no oxygen, a necessary component for the existence of animal life d. an enormous amount of methane and ammonia, which was never lost by the atmospheres of the outer planets e. virtually no nitrogen, the major component of today’s atmosphere