Astudent designed an experiment to test the effect of temperature on bacterial growth. he grew three different cultures of e. coli in three incubators at different temperatures. what was the independent variable in this experiment?

Temperature

Explanation:

An experiment has an independent variable which is a factor changed during the experiment. Effect of changes in the independent variable on the dependent variable is seen during the experiment.

According to the question, the experiment was set to observe the effect of temperature on bacterial growth. The bacterial population was exposed to different temperatures. Since the temperature was changed to observe its effect on bacteria growth, the temperature is the independent variable here.  

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.