A recipe calls for 1 cup of sugar and 1/2 cup of flour. Zoe
uses 1 cup of salt and 1/2 cup of flour.
Which kind of mutation is best modeled by Zoe's version of the recipe?

A. Insertion

B. Substitution

c. Transition

D. Beneficial

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

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 best describes the dropping height of a ball that bounces back up to a height of 45 cm