Dr. Lanzilotti wants to create a stimulus that will produce an afterimage of a red heart shape against a white background. He should make the heart and the background .

The question is incomplete as it does not have the options which are:

a. ?green; black

b. ?pink; red

c. ?red; green

d. ?blue; white

a. green; black

Explanation:

Afterimage is the image formed after the original image is perceived and visualized by the normal eyes and continues to appear in the eyes even the object is not present in the front of the eye. This is considered a type of optical illusion.

The rods and cone sensory cells allow is to see the image when they receive light from the environment.

In the given question, the afterimage of red color on the white background will be the green heart and black background. This is due to the reason that when the coen cells which perceived red light are desensitised by the red light and object will appear green or vice versa. Similarly when the rod cells will be desensitized by one color then another rod cells will work and the white will appear black.

Thus, Option-A is correct.

answer'(basidium)the spore--bearing structure of a basidiomycete is called a basidiocarp; ///

c is the answer : )               your welcome