Two characteristics that are unique to echinoderms are that they have radial symmetry and a water vascular system. Echinoderms use a hydraulic system to operate their limbs, and this system helps them eat. Examples of ec... More »

While there are certain basic characteristics shared by nearly all people, unique characteristics are most commonly found in the areas of physical appearance, personality, intellect, personal interests and hobbies. The c... More »

A unique characteristic of mitosis is that it produces two genetically identical daughter cells from the parent cell. This characteristic is critically important to the development of living organisms as it helps the bod... More »

Echinoderms use tube-like feet that protrude through their bodies to move, contracting and expanding these muscular structures by taking in and expelling water through an organ called an ampulla. This muscular action is ... More »

Starfish take in oxygen and dispel carbon dioxide through their tube feet, thin skin and a hole located on top of their body, and circulate the gases throughout their body using a water-vascular system. Their respiratory... More »

Sea stars breathe using simple diffusion through their tube feet, as well as with dermal gills that keep water moving past them with cilia. Oxygen is carried through the body via canals filled with fluid that differs lit... More »

The characteristics of arthropods include an exoskeleton, well-developed sense organs, jointed appendages, tagmata body regions, a ventral nervous system and bilateral symmetry. Scientists believe that the ancestors of t... More »