An aquifer is most closely related to ____
a. sea water
b. lake water
c. stream water
d. glacial water
e. groundwater
ANSWER: e
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During the first major divergence of life the
atmosphere was a. high oxygen, high carbon dioxide. b. high hydrogen, low oxygen. c. changing from anaerobic to aerobic. d. firmly in the age of aerobes. e. all of these.
Until Europeans began worldwide colonial activities about 500 years ago, humans had not introduced exotic species anywhere.
a. true b. false
Bacteria and fungi that secrete enzymes into the surrounding environment to break down wastes and dead organic matter are ________
Fill in the blank(s) with correct word
The typical lesion of primary syphilis is
A. purulent sore throat. B. a generalized rash. C. the development of buboes in the lymph nodes at the site of infection. D. a painless reddened lesion called a chancre at the site of infection. E. gummas in bones, in nervous tissues, or on the skin.