Homo erectus existed until approximately:a
5,000 years ago.
b. 10,000 years ago.
c. 100,000 years ago.
d. 200,000 years ago.
e. 1,500,000 years ago.
D
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A person is MOST likely to contract diseases such as Rocky Mountain spotted fever and ehrlichiosis if he or she visits/participates in
A) camping and hiking in the backcountry. B) metropolitan cities. C) snow skiing. D) European countries.
A ________ epidemic is characterized by a sharp rise to a peak then a rapid, but not as pronounced, decline in the number of individuals infected.
A. common-source B. sporadic C. herd D. propagated
What is the atomic mass number of an atom with 7 electrons, 7 neutrons, and 7 protons?
a. 7 daltons b. 10 daltons c. 14 daltons d. 21 daltons e. 28 daltons
A soil with approximately what percent of humus
is best for plant growth? a. greater than 90 b. 15 c. 50 d. less than 10 e. 30