List some characteristics of arthropods.?

Answer 1

The exoskeleton is made of a mucopolysaccharide called chitin. As the animal grows it must get rid of the exoskeleton ( molting ) before a new one can form.
Arthropods contain well developed sense organs. Compound eyes, sensory antennae, and tympanic membranes keep most arthropods in communication with their environment.
An open circulatory system is found in all arthropods. The hemolymph (blood) is propelled through the body by a tubular heart and collected in areas called sinuses. These are very few blood vessels in the arthropods.
They contain a variety of respiratory organs such as book lungs, trachea, spiracles and gills.
They contain bilateral symmetry.
Most all arthropods reproduce sexually. Some species of insects are parthenogenetic. The female organism , under certain circumstances , can produce fertile offspring without mating. A complex developmental process is common in insects. This process is called metamorphosis.
They contain a ventral nerve cord and a brain.
Excretory organs vary from green glands to Malpighian tubules.
The digestive system is complex and very efficient.
They are protostomes and coelomates.
The phylum contain the most known species than all the other phyla combined.

Answer 2

They have jointed feet (hence the name).

Read below for more information.

Answer 3

jointed feet
body divided into head, abdomen and thorax