The correct answer is B. Stage 2.
Explanation
In the image, four phases of the metamorphosis of insects are shown which are egg, larva, pupa, and imago. In phase two the larva is shown. Larvaes are soft and long also, their bodies are divided in segments and they do not have wings. In this phase, the insects are in their juvenile phase which is characterized by an organism that has anatomy, physiology, and ecology different from those of the adult insect. So the correct answer is 2.
Answer: Afterimage
Explanation:
Afterimage is the effect that occurs in form of optical illusion to the eyes.An image glimpses can be seen even when exposure towards it has ended.These glimpses are illusion that are presented through visual system where retina creates an impression .
According to the question,professor is describing about afterimage concept through making children stare at screen square image for a while and then showing them white screen which makes them see an illusion of red colored square image that is not actually present.Illusion is present where image shape is same but color is changed due to reception mechanism.