All known living things are made up of one or more cells<span>.
All living </span>cells come<span> from existing </span>cells<span> by division.
The </span>cell<span> is the fundamental unit of structure and function in all living organisms.</span>
Answer:
Arthropods have a tough, non-living outer shell called exoskeleton, which protect their soft bodies while echinoderms have living endoskeletons, which develops within the deeper skin or body tissues and act as their protective covering.Explanation:
