which of the following describes a properly controlled experiment? a. five tomato seeds are planted in an outdoor garden, while five radish seeds are planted in potted soil and kept indoors. b. a newspaper publishes a list of the 100 most popular movies of all time. c. fifteen turtles are fed iceberg lettuce and their weight is measured after three weeks. d. twenty mice are given orange juice every day, while another twenty mice are given just water.