If Substance A has an LD50 of 20 mg/kg of body mass, and Substance B has an LD50 of 10 mg/kg of body mass, which substance is considered more deadly? Substance A is deadlier than Substance B. Substance B is deadlier than Substance A. Both substances are equally deadly enough to half a population. Neither of them are deadly because they do not reach at least 50 mg/kg.

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?

What is the correct answer for the process of water eroding soil? rills, sheet erosion, gullies sheet erosion, rill, gullies gullies, rills, sheet erosion sheet erosion, gullies, rills

All organisms contribute some water to the water cycle by conducting