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.
Just as their eyes have a broader range of use, so do their noses. Hammerheads have wider nostrils than most sharks and are able to smell prey from a great distance. The great hammerhead shark when fully grown can reach up to 20 feet and can live between 25 and 35 years. Like humans, the female sharks carry their young, but they can produce between 20 to 50 pups at a time.