Statistics indicate that _______ percent of children with sickle-cell disease live to adulthood.
A. 25
B. 50
C. 75
D. 15
Answer: B. 50
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When, how, and to what extent any gene control
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In the fungus pictured, which of the following structures is indicated by B?
A. hyphae B. mycelium C. fruiting body D. spores E. rhizoid
Animals trapped and digested by "carnivorous" plants such as the cobra lily are used primarily as
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