When a sparkler is twirled rapidly, people perceive a circle of light. This occurs because:. a. the trail you see is caused by sparks left behind from the sparkler. b. due to its differing wavelengths, the light from the sparkler continues to radiate for about a second after it goes out. c. the length of iconic memory (the persistence of vision) is about a fraction of a second. d. Gestalt principles work to complete the circle in our minds.

the answer is a. monarch

what are the answer choices?

the correct answer is the following is a list of inventions made in the medieval islamic world, especially during the "islamic golden age" (8th to 13th centuries),[1][2] as well as the late medieval period, especially in the emirate of granada and the ottoman empire.

science and technology in the islamic world adopted and preserved knowledge and technologies from contemporary and earlier civilizations, including persia, india, china, and greece-roman antiquity, while making a number of improvements and innovations.

the use of electrical signals that transit messages is know as