Arthropods are the animals with a hard external skeleton like a suit of armour. The skeleton is jointed to allow movement. Arthropods have evolved in a different way to vertebrates and even their blood is
chemically different and so it is not red. They do not have a brain and spinal cord like vertebrates. Instead, they have a nerve cord running along the underside of their body, and small thickenings of this nerve cord instead of a brain . Arthropods have efficient eyes, but these work in a different way from those of vertebrates. Arthropods such as spider may have many eyes.
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