All animals share the following characteristic a. being a consumer, b having cell walls, c not having cell nuclei, d budding, Please include an explanation I just completed a test but I don't understand and when I looked for the question on it had 2 answers disagreeing

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?

Speed is the ratio of the distance of an object moves to

Si units are the modern form of the