Shellfish is a mollusk in a class of animals, but also belong to invertebrates.Compared with vertebrates, shellfish is a relatively low level of animals.Still, there are some body parts that they do have.Some shellfish have eyes.For example, scallops are a common shellfish, their eyes grow on their mantle, and the number of eyes is very large, there are hundreds of them.Of course, their eyes are different from the eyes of humans and many mammals, their eyes can not see things around them, but only have the most basic perception ability, perception of light and shade.
Of course, not all shellfish have eyes.Oysters, for example, when they're in their larval stage, they still have eyes.However, by the time they reach the juvenile stage, their eyespots have already degenerated.
As mentioned above, shellfish, as mollusks, are relatively low-level animals, so their body structure lacks some advanced and complex structures.Still, they have brains.Their brains are in a special place, some shellfish have their brains under their eyes, such as abalone. Some shellfish have eyes under their antennae, such as field snails.Although shellfish have brains, their thinking ability is far less than that of human beings and other advanced mammals and birds.
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