Scientists use potassium-argon method to determine the age of a rock sample. three separate tests showed the rock to be 1.3 billion years old. however, scientists know the rock must be at least 2.5 billion years old based on the rocks around it. how is this possible?

Aboy with an extra x chromosome probably has which of the following syndromes?

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

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?