The countries of ____ and ____ have the world’s highest human populations
a. India; China
b. China; United States
c. China; Brazil
d. India; United States
e. United States; Canada
ANSWER: a
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A deficiency of T-helper cells would affect both cell-mediated immunity as well as antibody production.
Answer the following statement true (T) or false (F)
A ribosome consists of ____
a. two small subunits b. two large subunits c. three subunits of different size d. rRNA and ribosomal proteins e. tRNA and ribosomal proteins
Endospores are
A. resistant to destruction by radiation. B. metabolically inactive. C. resistant to heat and chemical treatments. D. living structures. E. All of the choices are correct.
The region of the mantle below the crust is called:
a. the asthenosphere. b. the mantle. c. the lithosphere. d. the outer core.