What are the main characteristics of arthropods?

The main characteristics of arthropods include having segmented bodies and exoskeletons, which are key features that define this diverse group of animals. Arthropods, which encompass insects, arachnids, crustaceans, and others, typically have a body divided into distinct segments that may include a head, thorax, and abdomen. This segmentation allows for specialized functions and adaptations crucial for their survival.

Additionally, arthropods possess an exoskeleton made of chitin, which provides structural support and protection from environmental factors, predators, and water loss. This hard outer covering is periodically shed in a process called molting, allowing for growth.

The other options describe characteristics that do not apply to arthropods. For instance, soft-bodied and symmetrical descriptions are more aligned with organisms like cnidarians or worms. The mention of being warm-blooded and possessing vertebrates refers to mammalian features, while developed lungs and mammary glands are characteristics exclusive to mammals. These distinctions highlight the unique biological traits that set arthropods apart from other animal groups.