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.
Fossil hammerhead shark teeth are found in any marine Miocene and Pliocene deposits. These include deposits along the entire east coast of the United States. However, they are less common than many other shark species. Also, due to their relatively small size, they are often overlooked.