The 
would enable a woman to assess a man's level of commitment, detect the existence of prior commitments to other women or children, and simultaneously signal to the man her sexual fidelity.
The correct answers for this question is this one:
<span>In a pluralistic society, special interest groups have a right to the following:
- testify in court on behalf of immigrants
-meet with Congressional leaders to ask for the protection of religious minorities
-get a Senator to introduce legislation to ensure healthcare for Hispanic children
</span>
The answer is: his study does not qualify as an experiment. For the study to be an experiment, Dr. Kline would have to manipulate the independent variable in a group (for example, apply a certain treatment) and also have a control group to which he doesn’t apply such treatment.
In this case, the study is an observational study because he only observed the subjects that were in the zoo that morning and measured the variable of his interest, that is the environmental attitude of the visitors, he did not apply a certain treatment to the group nor manipulate any variable.
