Which of the following characteristics of living things could be applied to an automatic door at a supermarket? a. living things grow and develop. b. living things evolve over generations. c. living things respond to stimuli in the environment d. living things maintain a stable internal environment.

I believe the answer is c. living things respond to stimuli in the environment

An automatic door at a supermarket could open and close itself when someone approaching it. That mean the door somehow has the ability to sense if there is someone near it. When they sense someone approaching, they will respond by opening the door. This way, the door sounds like the living things that could detect stimuli and giving appropriate response afterward.

i think it is true in my reasonment ..

the answer will be a) proteins i believe