Now repeat this procedure while looking at the "X" in the lower panel. When the mouse disappears, what happens to the bars of the cage? How can you "see" something in what

you know is your blind spot? Why do you see the bars but not the mouse?

If you have trouble finding your blind spot, remember to move your head very slowly towards the

screen with your left eye covered.

Which of the following statements concerning cancer and mutations is correct? a: cancer can only occur with a mutation in a somatic cell. b: usually, multiple mutations are required in different genes to cause cancer. c: none of the other answer options is correct. d: cancer can only occur with a mutation in a germ cell. e: usually, a single mutation is all that is required to cause cancer.