In their study of the homeless in New York City, Ellen Baxter and Kim Hopper found that __________
A) poverty and disability lead to a series of crises, ending in homelessness
B) one event is sufficient to render a person homeless
C) homelessness is a choice, and there are many opportunities for adequate shelter
D) once people become homeless, they tend to stay that way for the rest of their lives
Answer: A
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Women who work in the coal mines in the Powder River Basin
a. typically only hold positions in administration and management. b. operate all of the heavy equipment used to extract the coal. c. work in all departments except as frontline supervisors in charge of crews. d. work mostly as mechanics.
Changes to genetic material, such as point mutations and chromosomal mutations, can create _________ within populations
a. sexual dimorphism b. family units c. selective forces d. variation
The material remains of human behavior are known as:
A. fossils B. artifacts C. casts D. lithics
Which of the following statements about human skin color is FALSE?
A. Light skin is a selective disadvantage in the tropics, because it is more susceptible to the destruction of the folate that is needed to produce folic acid to protect against neural tube defects in human embryos. B. Light skin is a selective advantage outside the tropics, because it admits ultraviolet radiation, which causes the body to manufacture vitamin D and thus prevents rickets and osteoporosis. C. The amount of melanin in the skin affects the body's production of vitamin D. D. The amount of melanin in the skin affects the body's ability to process lactose. E. Skin color varies because of differences in ultraviolet radiation between different regions of the world.