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.
Reaching a whopping 6+ metres (20ft), weighing up to 600kg (1,300 lb) and equipped with teeth similar to those of the bull shark there is no doubt the great hammerhead could easily inflict deadly injuries on a human. It is also suggested that these may be more aggressive than other hammerhead species.