All of the statements about the nitrogen cycle are true except one. that is a) lightning breaks nitrogen molecules so it can combine with oxygen. b) putting man-made fertilizers on farm fields exceeds natural nitrogen levels in the soil. c) bacteria located in the soil trap excess nitrogen and to remove it from plant roots. d) although nitrogen is the most abundant atmospheric gas, plants cannot use it from the air.

Sally and sue were investigating the topic of friction in science. they used a small car and a ramp as seen in the picture to test what they were learning. they knew that they slipped easily on waxed floors but not on carpet, so they decided to change the material on the surface of the ramp to see what happened. they planned to use glass, carpet, aluminum foil, and sandpaper and run the car down the ramp over each surface. what would be the best research question to guide the girls' experiment? a) does the amount of surface area affect the friction on the moving car? b) will the car travel fastest on the glass surface? c) how does the angle of the ramp affect the speed of the car? d)do rougher surfaces tend to create more friction than smooth surfaces?