In an experiment, the presence of a(n) is manipulated by the researchers so that its effects may be determined.

Independent variable

An independent variable  is a variable that stands alone and isn't changed by the other variables you are trying to measure. - An independent variable  is normally changed or controlled in a scientific experiment to test the effects on the dependent variable

the following men who did not in the unification of italy were.

a) giuseppe mazzini

c) alexander ll

the other two men were camilo cavour and giuseppe garibaldi they the unification of italy by yielding territories in the italian unification. in 1861 italy was declared a united-nation state under the sardinian king victor immanuel ll.

answer; environmental science;