Ms. Smith told her students to do 30 jumping jacks without stopping. When everyone had completed the jumping jacks, she asked the students to look around and observe each other. She said, "What do you notice about each other that is different from before you did the jumping jacks?" The changes that the students observed, rapid breathing and sweating, would be classified as a to a change in a system.
A)limit
B)response
C)stimulus
D)feedback mechanism

Which explanation is true about what happens to a ray of light when it strikes a mirror? a. a light ray is transmitted toward a mirror at a certain angle. the light ray is then reflected by the mirror at an equal angle but in the opposite direction of the transmitted ray. b. an incident ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then reflected at an angle equal to the angle of incidence but on the opposite side of the perpendicular line. c. a reflecting ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then refracted at an angle equal to the angle of the reflecting ray and on the same side of the perpendicular line. d. an incident ray strikes a mirror at an angle with a line parallel to the mirror. the light ray is then transmitted at an angle equal to the angle of incidence but on the opposite side of the parallel line. you so much! : -d take the time to try and answer correctly.

What is the molar mass of the anhydrous compound? answer using four significant figures. 36.02 g/mol 120.15 g/mol 156.12 g/mol

Once similarity and one difference between a mixture of elements and a mixture of compounds