What is a key characteristic of insects as members of the phylum Arthropoda?

Insects, as members of the phylum Arthropoda, are characterized by their exoskeleton, which is made of chitin. This stiff outer shell provides structural support and protection, enabling insects to survive in various environments. The chitinous exoskeleton is not only a defining feature of arthropods, but it also plays a crucial role in water retention and serves as an attachment point for muscles, facilitating movement.

Insects possess jointed appendages, which is a hallmark of arthropods, making them agile and capable of various movements. Additionally, insects typically have three body segments: a head, thorax, and abdomen, rather than a single body segment, distinguishing them from other organisms. Each of these characteristics supports their adaptation and success in diverse ecological niches.