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.
Interesting Hammerhead Shark Facts For Kids. 1  The length of the hammerhead sharks measure around 0.9 â 6 meters (3.0 â 20 feet). 2  The weight of these species is about 500 â 1,000 pounds. 3  The hammerhead sharks normally exhibit light grey to greenish tint skin color.