Which statement correctly describes electrochemical cells? A. Electrochemical cells involve only oxidation reactions.

B. Electrochemical cells involve only reduction reactions.

C. Electrochemical cells involve oxidation-reduction reactions.

D. Electrochemical cells do not involve oxidation-reduction reactions.​

If a planet rotates 360 degrees during a 24 hour time period, what does that tell us about the planet? a. the middle of the planet is in darkness b. the seasons on the planet vary every day. c. the planet runs on a 12-hour time clock. d. the temperature on the planet varies daily.

The image shows a process that releases nuclear energy which statement best identifies the process shown the process must be fusion because energy is released the process must be fusion because of have your nucleus formed a smaller nuclei the process must be fission because a large nucleus breaks into smaller nuclei the process must be fission because neutrons are formed

Which common material is an example of a polymer? (25 pts) a. steel b. plastic c. petroleum d. rubbing alcohol