The x-axis shows 'Average Annual Rainfall (in millimeters)' going from 0 to 3000 in increments of 1000. The y-axis shows 'Rate of Plant Tissue Production (in grams per meter square per year) going from 0 to 4000 in increments of 1000. The points are clustered between 0 and 200. A curve is drawn which shows a gradual increase of rate of plant tissue production with increase in rainfall.