Daniel is testing the impact of different soil pH levels on cucumber plant growth. He uses acidic, neutral, and alkaline soils and measures the height of the plants after 6 weeks. What are the independent and dependent variables in Daniel's experiment?

A nutritionist is evaluating the effect of different diets on weight loss. They set up 4 groups: Group A follows a high-protein diet, Group B follows a low-carb diet, Group C follows a balanced diet, and Group D does not change their diet. Which of the following is the negative control group?

Which of the following is an example of a false positive?