Insects have a protective outer exoskeleton.
Insects can be divided into two groups, those with a complete metamorphosis, and those with a gradual metamorphosis. The two types of life cycles are diagrammed here . Examples Aphids Grasshoppers Stinkbugs Leaf hoppers Mites are very small relatives of the spiders. Most are so small that they are difficult to see, but some are larger in size. Mites typically have two body segments, four pairs of legs and an exoskeleton.