What are spiders formed by?

Spiders are formed by a combination of biological processes during their development, starting from an egg. They undergo a series of molts as they grow, transitioning through various stages known as instars. Their bodies are composed of a hard exoskeleton made of chitin, and they have specialized glands that produce silk for web-building and other functions. The overall structure includes two main body segments: the cephalothorax and the abdomen, along with eight legs and various appendages.