▶ Your Answer : In this reading passage, there is ample support for the author's claim that the unique structure of hammerhead shark head has specific evolutionary merits. However, the professor in the lecture gives several reasons as a rebuttal to the author's point.
First, the professor contends that the unique head structure does not strengthen a vision of hammerhead shark. Although widely space eyes can help hammerhead shark have a deep perception. But, it will be a drawback directly. To be specific, sharks need to vision to identify prays and avoid an obstacle. However, the eyes are situated at wide head are not conducive to detect what is located at their forefront. This casts doubt on the reading passage's claim that unique head structure of the hammer sharks can help them have good vision.
Next, the professor insists that there is no sciencific evidence about hammerhead shark has a better sense of smell. Most sharks just have proper smell for hunting. So, they can not compared to other sharks about having a good sense of smell. This counters the reading passage's assertion that the shape of hammer help the sharks have a better sense of smell.
Finally, the professor argues that the shape of hammerhead does not help them move fast. They do not use their head when they turn to other side. In fact, they have more flexible backbone comparing to other shark. So, that is why they can move faster then other. This refutes the reading passage's suggestion that the unique head shape allows the animal to turn quickly. |