I need help with question a) , b) , and c)? Please hurry 25 points ?

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.

i think the answer is a, hope this : )

that would be because of both gravity and friction. so     c

b. a lightning bug, plug of grass, and a worm