Use the graph to make a claim about how plant growth is affected by sunlight

As can be seen in the graph, in general terms, the more sunlight the plants receive per day, the higher growth they have.
This is a quite linear process, with a drop in the growth on day 10 for the treatments with more sunlight exposure per day, but both return to the general trend on day 11.
In the case of 3 hours of sunlight per day treatment, it seemed like after 9 days of exposure the plants' growth started to slightly decrease.