Arachnida (spiders)

Arachnida is a class of joint-legged invertebrates that includes spiders, scorpions, ticks, and mites. Characterized by eight legs and a two-part body (the cephalothorax and abdomen), arachnids lack antennae and wings. They play essential roles in ecosystems as predators of insects, helping to maintain populations and balance in the food chain. Most spiders produce silk, which they use to create webs for trapping prey or for other purposes like building shelters. While some arachnids can be harmful (like certain ticks or venomous spiders), most are harmless and beneficial to humans and the environment.