Identifying Singular vs. Multiple Influences in Plant Growth Hypotheses

Two research teams, Team 1 and Team 2, conducted studies on the effect of sunlight on plant growth. Team 1 proposes that increased sunlight exposure directly leads to higher growth rates in plants. In contrast, Team 2 argues that while sunlight is important, other factors such as soil quality and water availability play a more significant role in plant growth. Based on their hypotheses, both teams designed experiments to test their theories.

Based on the information provided, which hypothesis is more focused primarily on a singular factor influencing plant growth?