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.
âThe rays are fast and can turn rapidly, so if the hammerhead is to catch one, it has to be able to keep its eye on the ball.â. Shark biologist Samuel Gruber of the Bimini Biological Field Station in Miami, Florida, says the paper has changed his view of the debate.