Which statement best compares frogs and toads with salamanders? Frogs and toads lose their tails as they develop into adults, but salamanders keep their tails.
Salamanders have lungs from the time they hatch, but frogs and toads have gills when they first hatch.
Frog and toad eggs are covered in a soft, jellylike substance, but salamander eggs are covered in a hard shell.
Salamander offspring are born with long legs that eventually shorten, but frogs and toads are born without legs.

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?