What scientific knowledge about macromolecules is a direct result of gerardus johnannes mulder’s 1838 discovery? all proteins contain carbon, hydrogen, oxygen, and nitrogen. all carbohydrates contain carbon, hydrogen, and oxygen. nucleic acids are polymers with nucleotide monomers. the helical structure of dna is essential for protein production. these are the answer choices

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?

The rapid decomposition of organic matter produces evidence which supports: the slow accumulation of coal deposits long ages of the earth rapid burial of vast amounts of vegetation biblical account of noah's flood

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?