Positive feedback loops:a. cause a response in the same direction as the initial stimulus. b. move the system further and further away from the set point. c. All of the answer options are correct. d. are activated by a stimulus. e. continue until interrupted or broken by an external signal.

It may possibly be c i think |-/

Aform of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space. there are many forms of  electromagnetic  energy including gamma rays, x rays, ultraviolet radiation, visible light, infrared radiation, microwaves and radio waves.