Emphasizes that 'exoskeleton' refers to a protective and supportive structure in animals. Hermit crabs can swap their exoskeletons for different shells as they grow.
Pro Tip 2/3
Visibility
Clarifies that an exoskeleton is visible, unlike bones which are hidden inside the body. The grasshopper's exoskeleton can be seen without dissection.
Pro Tip 3/3
Material Difference
Differentiates exoskeletons from human-made protections; exoskeletons are natural. Unlike armor, an exoskeleton is a natural part of the animal's body.