Picture 3 - This is a picture of beetles. Exoskeletons surround the body as a rigid, hard case. Arthropods, such as crustaceans and insects, have exoskeletons made of the polysaccharide chitin. An exoskeleton offers great protection to internal organs, resists bending, and provides attachment sites for muscles. However, in order for the arthropod to grow, it must molt and shed its old exoskeleton. During this period, arthropods are vulnerable. Exoskeletons also limit the growth of the arthropod. If these beetles grew to the size of humans, the weight and thickness of the exoskeleton would prevent movement.
Picture 4 - This is the picture of crabs. These crabs are crustaceans that were found along the shore during my stay in Korea. As you can see these crabs are fairly small, showing that the exoskeleton does keep arthropods to a certain size. These crabs were also very quick. Although these crabs are small, because their exoskeleton is also lighter and thinner, it allows for this quick movement.
Picture 3 - This is a picture of beetles. Exoskeletons surround the body as a rigid, hard case. Arthropods, such as crustaceans and insects, have exoskeletons made of the polysaccharide chitin. An exoskeleton offers great protection to internal organs, resists bending, and provides attachment sites for muscles. However, in order for the arthropod to grow, it must molt and shed its old exoskeleton. During this period, arthropods are vulnerable. Exoskeletons also limit the growth of the arthropod. If these beetles grew to the size of humans, the weight and thickness of the exoskeleton would prevent movement. 
Picture 4 - This is the picture of crabs. These crabs are crustaceans that were found along the shore during my stay in Korea. As you can see these crabs are fairly small, showing that the exoskeleton does keep arthropods to a certain size. These crabs were also very quick. Although these crabs are small, because their exoskeleton is also lighter and thinner, it allows for this quick movement.
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