Does a circle, square, or u-shaped magnet pick up the most paperclips?
Does a piece of cheese, bread, apple, or carrot decompose the fastest?
Does a slug, snail, or worm travel the fastest?
Does a fern, daisy, or cactus wither first without water?
Does a toy car roll farther with a low, medium, or high ramp?
Does a plant grow better facing north, south, east, or west?
Does along, medium, or short wingspan produce the longest flight of a paper airplane?
Does a plant grow taller in soil, slightly salty soil, or very salty soil?
What animals visit my yard? (set up food stations, take pictures, or tracks)
Does clay,sand, or humus absorb the most water?