An organ consists of (two or more types of tissue ) working together to( perform specialized functions ). By weight, the (skin ) is the largest organ of the body. It consists of various tissues and ( accessory structures ), and forms a strong, environmentally-resistant covering to protect the rest of our bodies. It has many homeostatic functions. Some of the functions include forming ( ) and ( ), ( ), and maintaining ( ). It is also an active part of our ( ) and ( ) systems, ( ) wastes and synthesizes ( )