What conclusion can be drawn from the observation "The pH of the solution is 2"?

Living and non-living things can be distinguished through their various characteristics. Which of the following characteristics of certain pathogens is not considered an important aspect of living organisms?

A scientist observes that plants grow at different rates under different light conditions. She wants to determine how light intensity affects plant growth. Which of the following is an example of a prediction in the context of the plant growth experiment?