Final answer:
Arthropods have jointed appendages that allow them to perform various functions. Their exoskeleton helps with protection and water retention, facilitating their success on land.
Step-by-step explanation:
Arthropods are characterized by a segmented body and jointed appendages. They have a complex nervous system, a soft exoskeleton, and endoskeleton. The jointed appendages allow arthropods to have a wide range of movements and perform various functions such as walking, capturing food, and sensing the environment.
The exoskeleton provides protection and helps retain water, which facilitated their success on land by preventing dehydration and supporting their body weight.