Endoskeleton
The stratum corneum is the tough outer layer of the skin.
Arthropod have exoskeleton. The exoskeleton is composed of a thin, outer protein layer, the epicuticle, and a thick, inner, chitin–protein layer.
Yes. Arthropods are characterized by an exoskeleton made mostly from the tough protein chitin, also joint appendages and segmented bodies.
The sac consists of two layers, the parietal (outer) and visceral (inner) layer
The outer layer of the eyeball is called the sclera. It is a tough, white, fibrous tissue that helps to maintain the shape of the eye and protect the delicate structures inside.
The outer shell of a watermelon is called the rind or peel. It is the tough outer layer that is typically green in color and protects the fruit inside.
the seed coat
The exoskeleton is the hard outer shell of arthropods.
The tough white coating of the eye is called the sclera.
The tough nonliving outer layer of each plant cell is called the cell wall. It provides structure and support to the cell, protecting it from damage and maintaining its shape. The cell wall is composed mainly of cellulose.
anulus fibrosus
connectiveThe outer layer of a blood vessel (artery or vein) is called the tunica externa or tunica adventitia.See http://training.seer.cancer.gov/module_anatomy/unit7_3_cardvasc_blood1_classification.htmlpericardium is the layer of the blood vessel that is made of tough connective tissue.