Why does mercury only have a thin atmosphere
a. it's small size and hot temperatures caused gas particles to escape.
b. the high temperatures burn off the carbon dioxide and oxygen.
c. the solar wind moves past mercury too fast to be captured.
d. it does not have enough gravity to hold the atmospheric gases.

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a. a researcher uses the customs office’s passenger lists for ships bringing immigrants to the us between 1820-1845 to track the numbers of immigrants from certain ethnic groups.b. a researcher conducts a linguistic study of comments posted on a local public blog.c. a developmental psychologist videotapes interactions between groups of toddlers and their care givers to determine which intervention methods most effectively manage aggression.d. a researcher asks the director of a local free clinic about the number of patients in the last two years with newly diagnosed hiv/aids.

What statement about risks in social and behavioral sciences research is most accurate: anonymizing data effectively manages the risk of creating emotional distress.risks are specific to time, situation, and culture.there are never any risks.if a study offers potential benefits, it is not necessary to minimize risks.

Abrief, "first-step" presentation of a work to be completed is called a