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 kangaroo rat reproductive rates,what term would best describe the interaction between kangaroo rats and grasses in 1935? Why?
Definitions:
Sulphuric Acid
A highly corrosive strong mineral acid with the chemical formula H2SO4, used in various industrial processes.
Nitric Acid
A highly corrosive mineral acid (HNO3) used in the manufacture of fertilizers, explosives, and in various industrial processes.
PANs
Personal Area Networks (PANs) are networking technologies for interconnecting devices within a close proximity, typically within a few meters, such as computers, smartphones, and personal digital assistants.
Pollutants
Substances that contaminate air, water, or soil, causing harm or discomfort to organisms and the environment.
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