Colombia- Juan Manuel Santos
Mexico- <span>Enrique Peña Nieto</span>
Costa Rica- Luis Guillermo Solís
El Salvador- Salvador Sánchez Cerén
Answer:
here is your answer
Explanation:
scientific study
In a scientific study, a control group is used to establish a cause-and-effect relationship by isolating the effect of an independent variable. Researchers change the independent variable in the treatment group and keep it constant in the control group. Then they compare the results of these groups.
A bargain is considered to be void if a court has judged a person to be mentally incompetent at time that the bargain was formed.
$13.44 is the price of one 5-pound box of nails :)