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.
Well there are 9 different species of Hammerhead Sharks : Winghead shark Scalloped bonnethead White fin hammerhead Scalloped hammerhead Scoophead Great hammerhead â¦ Bonnethead Smalleye hammerhead Smooth hammerhead The Great and the Scalloped hammerhead are listed on the World Conservation Union's 2008 Red List as endangered, whereas the Smalleye hammerhead is listed as vulnerable. As for the other species they are not endangered.