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.
Other physical characteristics of the hammerhead sharks are similar to another shark species. They have nostrils at the tip of their head and large eyes at each side of it. The mouth is small, contains serrated teeth and locates under the head. They have two dorsal fins, the first larger than the other.