Research Papers. 1  Establish your topic. 2  Look for sources of information. 3  Read your sources and take notes. 4  Organize your ideas. 5  Write a first draft. 6  Use footnotes or endnotes to document sources. 7  Write a bibliography. 8  Revise the first draft. 9  Proofread the final draft.
The Retina. The retina is a light-sensitive layer at the back of the eye that covers about 65 percent of its interior surface. Photosensitive cells called rods and cones in the retina convert incident light energy into signals that are carried to the brain by the optic nerve.
Most fish see colors. As with people, the retina of a fishâs eye contains two types of cells: cones and rods. Cones are used for day vision and are the cells that discern color. Rods are used for night vision and cannot distinguish colors, although they can discern light. A rainbow of brightly colored fishing tackle.