Use the following to answer questions :
Refer to the graph below showing the grass abundance in plots with and without the presence of kangaroo rats between 1931 and 1945 at the Santa Rita Experimental Range in southern Arizona. 
-If we assume that the presence of the grasses increases rat reproductive rates,what term would best describe the interaction between rats and grasses in 1945? Why?
Definitions:
Initiative
A process that allows citizens to propose and vote on legislation directly, bypassing the legislative body.
Boss System
A political system dominated by a single leader or group of leaders (bosses) who have enough power to control political appointments, the distribution of favors, and the outcome of elections.
Civil Rights
The rights of individuals to receive equal treatment (and to be free from unfair treatment or discrimination) in a number of settings – including education, employment, housing, and more – based on certain legally-protected characteristics.
Society of American Indians
A progressive organization founded in the early 20th century, aiming to promote the rights and welfare of Native Americans.
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