Which of the following are probably the most abundant but least understood of all forms of life on Earth?
a. insects
b. bacteria
c. animals
d. trees
Answer: b. bacteria
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During conditions of high humidity, the effectiveness of perspiration as a cooling mechanism for the human body
A) is reduced because less sweat can evaporate B) is reduced because less condensation occurs C) is enhanced because more sweat can evaporate D) is enhanced because more condensation occurs
What technology made suburbs possible?
A) automobiles B) highways C) telephones D) electrical energy E) all of the above
The ozone layer is crucial for filtering out __________.
gamma radiation infrared radiation visible light ultraviolet radiation
What contributes to the high biological activity and surface nutrients in southern polar waters?
a. Deep-water upwelling b. Weak stratification c. There is a lack of continental margins d. All are contributing factors