Treating malaria with drugs is difficult because
A) no drug has yet been found that effectively treats malaria.
B) the malarial parasite has quickly evolved drug resistance.
C) it is impossible to distribute drugs to regions affected by malaria.
D) the best drugs cost thousands of dollars per person.
B
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Minerals are composed of
A) silicon compounds. B) common types of rocks. C) elements joined as compounds. D) homogeneous solids.
When the sun, moon, and Earth are all in a line, the ____
A) gravitational attraction will be less B) difference between high and low tides will be minimal C) arrival of high tide will be delayed D) highest high and lowest low tides will occur
Classic Newtonian reflector telescopes use a mirror shaped like ________
A) a convex spherical surface B) a concave spherical surface C) a hyperbola D) a parabola
Describe the characteristics of an atypical cold front.?
What will be the ideal response?