Which of the following is NOT a characteristic of Arthropoda?

The presence of tube feet is not a characteristic of the phylum Arthropoda. Instead, tube feet are a defining feature of echinoderms, such as starfish and sea urchins, which use these structures for locomotion and feeding. In contrast, arthropods are characterized by their exoskeleton made of chitin, jointed appendages that enable a variety of movements and functions, and segmented bodies that allow for specialization of body regions. These structural features contribute significantly to the success of arthropods in diverse environments, providing support and flexibility for a wide range of activities from walking to grasping. The other characteristics directly relate to the biological and physical attributes of arthropods, further highlighting the distinction between these two groups of animals.