Why Is Sickle Cell Disease More Common in Americans with African

question 14

Multiple Choice

Why is sickle cell disease more common in Americans with African ancestors than Americans with European ancestors?

• A)Sickle-shaped blood cells caused malarial parasites to die,and thus gave protection against malarial infections prevalent in AfricA.
• B)Sickle-shaped blood cells were good hosts for tuberculosis,and thus spread tuberculosis widely throughout Africa.
• C)Sickle-shaped blood cells caused cholera bacteria to die,and thus gave protection against large-scale cholera epidemics throughout Europe.
• D)Sickle-shaped blood cells caused tuberculosis bacteria to die,and thus gave protection against large-scale Tb epidemics throughout crowded areas in Africa.
• E)Sickle-shaped blood cells were good hosts for cholera bactera,and thus caused many people to die from cholera and diarrhea.

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The interest rate stated on a loan or investment agreement, not accounting for inflation or other factors that affect the real rate of return.

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Interest on an investment calculated each month and added to the principal, increasing the amount on which future interest is computed.

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