Hakeem is testing the effects of sunlight on samples of soil. Which of these actions would introduce confounding variables into Hakeem’s experiment?

What stage(s) of cellular respiration make atp?

Organisms are classified, or grouped into categories, based on similarities in their characteristics and/or evolutionary relationships. the study of how organisms are classified is known as

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?