The Spider Has One Important Part Of It's Body Outside It's Body. Which One Is It?

A spider in general is made differently from other insects of the world; in fact, it is not even an insect; it is an arachnid.
While an insect body is generally divided into three main parts: the head, the thorax, and the abdomen at the end, in the spider the head and the thorax fuse together to form the cephalothorax. A spider has eight legs, unlike an insect, which has six legs.
What is especially amazing about the spider is the fact that it has an important part of its body outside its body: its skeleton.
Termed an 'exoskeleton', this is a sclerotized or hardened shell, which protects the spider, because the spider does not have any bones. The spider's muscles are attached to the inner part of the exoskeleton, and the spider moves about by contracting the muscles.
When a spider grows, the exoskeleton actually splits open and the grown up spider emerges, leaving behind its old exoskeleton, and armed with a brand new one!

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