Which of the following is least likely to be a scientific experiment? a. leo places one plant in direct sunlight and two others in the shade. he observes them for 10 days. b. carmen changes the weight on the end of a pendulum. she notes each time how long it takes the pendulum to cycle. c. byron checks the ph level in 10 water samples. he maps the reading to the location where he took the sample. d. emma trims the stems of a bouquet of flowers. she places the flowers in a vase on the dining table.