The Percentage of Americans Who Move Each Year

question 283

Multiple Choice

The percentage of Americans who move each year.

• A) is less than 2 percent.
• B) is more than 50 percent.
• C) is about 12 percent.
• D) is about 36 percent.
• E) difficult to estimate because some people move within the same town.

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Definitions:

Natural Killer Cells

A type of lymphocyte that plays a major role in the rejection of tumors and cells infected by viruses by directly killing them.

Eosinophils

A type of white blood cell that is involved in combating multicellular parasites and certain infections in vertebrates, also associated with allergic reactions.

Parasitic Worm Infection

An infestation by helminths, a type of parasitic worm, which can cause disease and malnutrition.

Phagocytic Cells

A type of immune cell capable of engulfing and absorbing bacteria and other small cells and particles.