In science class, Maria observes a white-colored cut flower. She sees that the petals turn red when the flower is sitting in a vase that has red-colored water. She forms a hypothesis that the color reaches the flower through the stem. What should Maria do to confirm the hypothesis?

A.
She should repeat the experiment with the same type of flower and photograph the changes over time.
B.
She should ask her science teacher about the flower to confirm whether her hypothesis is correct.
C.
She should try the experiment with a potted plant with roots and observe any color changes.
D.
She should repeat the experiment with a different species of plant and photograph the changes.
Answer of this question is A. because I just took the question and got it right

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?