In subsequent citations, only use the first author's last name followed by et al. in the signal phrase or in parentheses. (Kernis et al., 1993). In et al. , et should not be followed by a period.
Transcript of Hammerhead Shark Eyes. Structure of Eye. The structure of a hammerhead sharks eye is very similar to the human eye, they have a cornea, lens, retina, pupil and iris. Their retina has both cone and rod cells, which means they can see light, dark, and colours.
Credit: Allie_Caulfield CC-BY-2.0. The hammerhead is a migratory shark that is distributed widely around the world. In the United States, it can be found in the waters along the Atlantic coastline all the way to Florida and around to the Gulf of Mexico. In the Pacific, this shark can be found from California through Mexico and southward to Peru. It is also found in the Caribbean region, in the Mediterranean Sea from Senegal to Morocco and in the Indian Ocean from French Polynesia to New Caledonia.