Guard cells are specialized cells in the epidermis of leaves, stems and other organs that are used to control gas exchange,
including water vapor via transpiration. Guard cells perceive and process environmental stimuli to trigger cellular responses
resulting in stomatal opening or closure. All but one environmental stimuli might trigger stomatal opening. That would be

Ascientist is studying muscle twitches in chicken quadriceps. to activate the muscle, he needs to provide stimulus to the

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 are they five steps of cloning?