Aprocess permitted in some states whereby voters may put proposed changes on the state constitution to a vote if sufficient signatures are obtained on petitions calling for such a referendum

The process allowing voters to propose changes to a state constitution if they can get sufficient signatures on the petitions, is called an "Initiative Petition"

Explanation:

In the United States, an "Initiative Petition" grants people the right to make changes to certain state laws if they can get a certain minimum number of signatures from registered voters, on a petition calling for such changes.

Washington DC along with twenty six other states in the United States, currently allow initiative petitioning.

answer; cattle ranching on the savanna,and forestry in the amazon;

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.