The independent variable is "colder temperature".We need to identify the independent variable in the following statement:⇒ Tomato seeds will grow at a faster rate if planted in colder temperatureRemember that the dependent variable depends on / is the result of the independent variable. So let's see. We have two variables:⇒ Tomato seeds⇒ Colder tempThe rate at which tomato seeds grow depends on how cold the temp is. So, the independent variable is "colder temperature".