One group of students is investigating the properties of cha…

One group of students is investigating the properties of charged objects. Their observations are listed below. When two positively charged objects are brought close to each other, they push each other away. When two negatively charged objects are brought close to each other, they push each other away. When a positively charged object is brought close to a negatively charged object, they pull toward each other. The experiment was repeated by several students using different charged objects. The results were the same. Based on the investigations, which of these theories would the students most likely propose? (2 points)

One student did an experiment to find if fertilizer can make…

One student did an experiment to find if fertilizer can make plants grow taller. The steps of the experiment are listed below. Take three pots of the same size. Fill the pots completely with the same type of soil. Plant tomato seeds in the first pot, orange seeds in the second pot, and bean seeds in the third pot. Add different amounts of fertilizer to the three pots. Keep the pots in the sunlight. Add the same amount of water to the pots every day. Measure the heights of the plants after regular intervals. The results of the experiment were not valid. Which of these statements best describes a flaw in the experiment? (2 points)